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{{Ref-Eycleshymer1910}} | |||
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! Online Editor | |||
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This is the eleventh volume by Eycleshymer and Wilson published in 1910 in the series [[Book - Normal Plates of the Development of Vertebrates|Normal Plates of the Development of Vertebrates]] edited by [[Embryology History - Franz Keibel|Franz Keibel]]. | |||
<br><br> | |||
<br> | |||
See other volumes in this series: | |||
{{Keibel vertebrate series}} | {{Keibel vertebrate series}} | ||
<br> | |||
Also the 2 volume set on human embryology: {{Ref-KeibelMall1910}} {{Ref-KeibelMall1912}} | |||
<br><br> | |||
'''Modern Notes:''' | |||
<br> | |||
|} | |||
{{Historic Disclaimer}} | {{Historic Disclaimer}} | ||
=Normal Plates of the Development of the Salamander Embryo (''Nectürüs maculosus'')= | |||
''Normentafeln zur Entwicklungsgeschichte der Wirbeltiere'' by [[Embryology_History_-_Franz_Keibel|Franz Keibel]] | |||
[[File:Keibel1910 titlepage.jpg|thumb|300px|title page]] | [[File:Keibel1910 titlepage.jpg|thumb|300px|title page]] | ||
{{Keibel vertebrate series}} | |||
By | |||
Albert C. Eycleshymer and James M. Wilson. | |||
St. Louis University, St. Louis Mo., U.S.A. | |||
With 3 Plates. | |||
Jena, | |||
Verlag Von Gustav Fischer. | |||
1910. | 1910. | ||
==Preface== | ==Preface== | ||
The preparation of the normal tables and plates on Nedurus was begun several years ago by Professor C. O. Whitman but on account of unavoidable circumstances the work was delayed. It was later taken up by Professor Eycleshymer upon the suggestion of both Professor Whitman and Professor Keibel. While Professor Whitman has not directly participated in the later work, he has furnished the senior author with material and Information without which it would have been impossible to complete the work. In the completion of the work the senior author has been fortunate in having the able Cooperation of Professor James M. Wilson. | The preparation of the normal tables and plates on Nedurus was begun several years ago by Professor C. O. Whitman but on account of unavoidable circumstances the work was delayed. It was later taken up by Professor Eycleshymer upon the suggestion of both Professor Whitman and Professor Keibel. While Professor Whitman has not directly participated in the later work, he has furnished the senior author with material and Information without which it would have been impossible to complete the work. In the completion of the work the senior author has been fortunate in having the able Cooperation of Professor James M. Wilson. | ||
==Table of Contents== | ==Table of Contents== | ||
{| | |||
| | |||
* Description of illustrations | * Description of illustrations | ||
* Introduction to tables | * Introduction to tables | ||
Line 94: | Line 79: | ||
* B. Alphabetical arrangement of authors under topics | * B. Alphabetical arrangement of authors under topics | ||
* Plates. | * Plates. | ||
| [[File:Keibel1910 plate1-2.gif]] | |||
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==Description of lllustrations== | ==Description of lllustrations== | ||
Line 103: | Line 89: | ||
===Plate 1=== | ===Plate 1=== | ||
{| | {| | ||
| Fig. I. (X 10.) | | Fig. I. (X 10.) Side view of egg 1 day 4 hrs. after deposition. The first cleavage groove has reached the lower pole of the egg. Second grooves extend to level of the equator of the egg. | ||
Side view of egg 1 day 4 hrs. after deposition. The first cleavage groove has reached the lower pole of the egg. Second grooves extend to level of the equator of the egg. | |||
Fig. 2. (X 10.) | Fig. 2. (X 10.) | ||
Line 140: | Line 124: | ||
Top view of egg 4 days 4 hrs. old. Segmentation cavity shows through thin translucent roof. Blastopore not präsent. | Top view of egg 4 days 4 hrs. old. Segmentation cavity shows through thin translucent roof. Blastopore not präsent. | ||
Fig. 10. (X 10.) | Fig. 10. (X 10.) Bottom view of egg 6 days 16 hrs. old. Crescentic blastopore. Line of invagination sharply separates large yolk cells from small cells of blastodisc. | ||
Fig. II. (X 10.) Dorso-lateral view of egg 10 days 10 hrs. old. Large circular blastopore; faint indication of embryonic anläge. | |||
Fig. 12. (X 10.) Side view of egg 10 days 16 hrs. old. Large circular blastopore. Anlage of mesial portion of embryo above dorsal lip of blastopore. Segmentation cavity faintly outlined. | |||
Fig. 12. (X 10.) | |||
Side view of egg 10 days 16 hrs. old. Large circular blastopore. Anlage of mesial portion of embryo above dorsal lip of blastopore. Segmentation cavity faintly outlined. | |||
| [[File:Keibel1910_plate01.jpg|600px]] | | [[File:Keibel1910_plate01.jpg|600px]] | ||
|} | |} | ||
<gallery> | <gallery> | ||
File:Keibel1910 fig01.jpg|Fig. 1. | File:Keibel1910 fig01.jpg|Fig. 1. (X 10.) Side view of egg 1 day 4 hrs. after deposition. The first cleavage groove has reached the lower pole of the egg. Second grooves extend to level of the equator of the egg. | ||
File:Keibel1910 fig02.jpg|Fig. 2. | File:Keibel1910 fig02.jpg|Fig. 2. | ||
File:Keibel1910 fig03.jpg|Fig. 3. | File:Keibel1910 fig03.jpg|Fig. 3. | ||
Line 176: | Line 154: | ||
Fig. 14. (X 10.) | Fig. 14. (X 10.) | ||
Top view of egg 14 days 4 hrs. old. Blastopore smaller, lateral margins of anterior portion of | Top view of egg 14 days 4 hrs. old. Blastopore smaller, lateral margins of anterior portion of embryo bounded by short broad ridges which are the beginnings of the lateral portions of the neural fold. At anterior margin of embryo there is a transverse crescentic ridge which is beginning of transverse portion of neural fold. Neural groove deep but does not extend either to transverse portion of neural fold or to blastopore. Segmentation cavity crescentic. | ||
embryo bounded by short broad ridges which are the beginnings of the lateral portions of the neural | |||
fold. At anterior margin of embryo there is a transverse crescentic ridge which is beginning of transverse | |||
portion of neural fold. Neural groove deep but does not extend either to transverse portion of neural | |||
fold or to blastopore. Segmentation cavity crescentic. | |||
Top view of egg 14 days 19 hrs. old. Blastopore much reduced, circular. The yolk plug is not | Fig. 15. (X 10.) Top view of egg 14 days 19 hrs. old. Blastopore much reduced, circular. The yolk plug is not visible in this egg. Lateral and transverse portions of neural fold united to form continuous fold around anterior portion of embryo. Lateral boundaries of posterior portion of embryo not defined. Neural groove not as long, nor as distinct as in preceding stage. Dark crescentic area in front of embryo is segmentation cavity. | ||
visible in this egg. Lateral and transverse portions of neural fold united to form continuous fold around | |||
anterior portion of embryo. Lateral boundaries of posterior portion of embryo not defined. Neural groove | |||
not as long, nor as distinct as in preceding stage. Dark crescentic area in front of embryo is segmentation cavity. | |||
Fig. 16. (X 10.) | Fig. 16. (X 10.) | ||
Top view of egg 15 days 15 hrs. old. Blastopore small, circular; yolk plug visible. Neural fold prominent, its free ends extend nearly to blastopore. Neural groove deep and narrow at anterior end, broad and shallow at posterior end, fades out just in front of blastopore. A part of the segmentation cavity is still apparent in front of the embryo. | |||
Top view of egg 15 days 15 hrs. old. Blastopore small, circular; yolk plug visible. Neural fold | |||
prominent, its free ends extend nearly to blastopore. Neural groove deep and narrow at anterior end, broad | |||
and shallow at posterior end, fades out just in front of blastopore. A part of the segmentation cavity is | |||
still apparent in front of the embryo. | |||
Fig. 17. (X 10.) | Fig. 17. (X 10.) | ||
Top view of egg 16 days 6 hrs. old. Blastopore reduced to a very minute circular aperture. Neural plate narrower than in preceding stage. Neural fold prominent, its free ends coalescing at blastopore. Neural groove extends to transverse portion of fold but does not reach blastopore. Segmentation cavity no longer visible in surface views. | |||
Top view of egg 16 | |||
plate narrower than in preceding stage. Neural fold prominent, its free ends coalescing at blastopore. | |||
Neural groove extends to transverse portion of fold but does not reach blastopore. Segmentation cavity | |||
no longer visible in surface views. | |||
Fig. 18. (X 10.) | Fig. 18. (X 10.) | ||
Top view of embryo 17 days 2 hrs. old. Blastopore an elongated narrow aperture between ends of neural fold. Neural plate narrower than in preceding stage. The constricted portion represents in a general way the division between head and trunk. Neural fold most prominent in head region. | |||
Top view of embryo 17 days 2 hrs. old. Blastopore an elongated narrow aperture between ends | |||
of neural fold. Neural plate narrower than in preceding stage. The constricted portion represents in | |||
a general way the division between head and trunk. Neural fold most prominent in head region. | |||
Fig. 19. (X 10.) | Fig. 19. (X 10.) | ||
Top view of egg 17 days 17 hrs. old. Blastopore no longer visible. Neural plate narrowest posteriorly; broad in head region, showing boundary zone between head and trunk. Lateral portions of fold | Top view of egg 17 days 17 hrs. old. Blastopore no longer visible. Neural plate narrowest posteriorly; broad in head region, showing boundary zone between head and trunk. Lateral portions of fold coalesced at posterior end of embryo. At anterior end of embryo a deep groove partially separates the two halves of the neural fold. | ||
coalesced at posterior end of embryo. At anterior end of embryo a deep groove partially separates the two halves of the neural fold. | |||
Fig. 20. (X 10.) | Fig. 20. (X 10.) | ||
Top view of egg 18 days 13 hrs. old. Lateral portions of neural fold almost united except in | Top view of egg 18 days 13 hrs. old. Lateral portions of neural fold almost united except in head region where they are still widely separated. In the antero-lateral portions of the fold are slight evaginations which are the beginnings of the optic vesicles. | ||
head region where they are still widely separated. In the antero-lateral portions of the fold are slight | |||
evaginations which are the beginnings of the optic vesicles. | |||
Fig. 21. (X 10.) | Fig. 21. (X 10.) | ||
Line 225: | Line 181: | ||
Fig. 22. (X 10.) | Fig. 22. (X 10.) | ||
Dorso-lateral view of embryo 20 days 10 hrs. old, length 6 mm, 6 pairs of myotomes. Outline of | Dorso-lateral view of embryo 20 days 10 hrs. old, length 6 mm, 6 pairs of myotomes. Outline of body conforms to curvature of egg. Head end of embryo shows three longitudinal ridges; middle ridge lies slightly above level of lateral ridges. The middle one is common anläge of fore, mid and bind brain. The lateral ones are the common anläge of the optic vesicles and branchial arches. Anus formed. | ||
body conforms to curvature of egg. Head end of embryo shows three longitudinal ridges; middle ridge | |||
lies slightly above level of lateral ridges. The middle one is common anläge of fore, mid and bind brain. | |||
The lateral ones are the common anläge of the optic vesicles and branchial arches. Anus formed. | |||
Fig. 23. (X 10.) | Fig. 23. (X 10.) | ||
Side view of embryo 21 days 2 hrs. old, length 7 mm, 10 — 12 pairs of myotomes. General outline | Side view of embryo 21 days 2 hrs. old, length 7 mm, 10 — 12 pairs of myotomes. General outline of body conforms to curvature of egg. Head slightly raised above surface of yolk. Slight enlargement at end of tail. A distinct enlargement of anterior end of head shows optic vesicles; just posterior to this enlargement is the anläge of the branchial arches. Anus shows just below tip of tail. | ||
of body conforms to curvature of egg. Head slightly raised above surface of yolk. Slight enlargement at | |||
end of tail. A distinct enlargement of anterior end of head shows optic vesicles; just posterior to this | |||
enlargement is the anläge of the branchial arches. Anus shows just below tip of tail. | |||
Fig. 24. (X 10.) | Fig. 24. (X 10.) | ||
Dorso-lateral view of embryo 22 days 17 hrs. old, length 8 mm, l6~i8 pairs of myotomes. Embryo | Dorso-lateral view of embryo 22 days 17 hrs. old, length 8 mm, l6~i8 pairs of myotomes. Embryo much curved laterally. Anterior half of head free from yolk. Caudal enlargement more prominent. Optic vesicles and mandibular arch well defined. The hyoid and first branchial arches are discernible ; also the common anläge of the second and third branchial arches. | ||
much curved laterally. Anterior half of head free from yolk. Caudal enlargement more prominent. Optic | |||
vesicles and mandibular arch well defined. The hyoid and first branchial arches are discernible ; also the | |||
common anläge of the second and third branchial arches. | |||
| [[File:Keibel1910_plate03.jpg|600px]] | | [[File:Keibel1910_plate03.jpg|600px]] | ||
|} | |} | ||
Line 263: | Line 210: | ||
| Fig. 25. (X 5.) | | Fig. 25. (X 5.) | ||
Side view of embryo 23 days 10 hrs. old, length 9 mm, 20 — 22 pairs of myotomes. General outline | Side view of embryo 23 days 10 hrs. old, length 9 mm, 20 — 22 pairs of myotomes. General outline of the body straighter. Head free from yolk. Caudal enlargement becoming free. Optic vesicles and forebrain much larger. Mandibular, hyoid, first branchial, and common anläge of second and third branchial arches well defined. Otic vesicle visible above hyoid arch. | ||
of the body straighter. Head free from yolk. Caudal enlargement becoming free. Optic vesicles and | |||
forebrain much larger. Mandibular, hyoid, first branchial, and common anläge of second and third branchial | |||
arches well defined. Otic vesicle visible above hyoid arch. | |||
Fig. 26. (X 5.) | Fig. 26. (X 5.) | ||
Side view of embryo 24 days 22 hrs. old, length 10 mm, 23 — 24 pairs of myotomes. General | Side view of embryo 24 days 22 hrs. old, length 10 mm, 23 — 24 pairs of myotomes. General outline of body of embryo straighter, less curved laterally. Head and caudal extremities free from yolk. Yolk becoming oval. Optic vesicles prominent. Ear better defined. Olfactory pits present. The mandibular, hyoid and first branchial arches are distinct. The second and third branchial arches are not yet differentiated, a slight process on the first branchial indicates the beginning of the gill bar. The anläge of the heart is visible just beneath the arches. | ||
outline of body of embryo straighter, less curved laterally. Head and caudal extremities free from yolk. | |||
Yolk becoming oval. Optic vesicles prominent. Ear better defined. Olfactory pits present. The mandibular, | |||
a slight process on the first branchial indicates the beginning of the gill bar. The anläge of the heart is | |||
visible just beneath the arches. | |||
Fig. 27. (X 5.) | Fig. 27. (X 5.) | ||
Side view of embryo 26 days old , length 1 1 mm , 26—27 myotomes. General outline of body straighter than in preceding stage. Head projects some 3 mm beyond margin of yolk; tail projects 1.2 mm, is thinner laterally but broader dorso-ventrally. Eye, ear, nasal pits and mouth well defined. Maxillary process discernible. Mandibular arches longer, but ventral ends widely separated. Second and third branchial arches formed. Gill bars present on three branchial arches. Anterior limb buds indicated; faint anläge of posterior limb buds. Yolk pear-shaped. Heart prominent. First surface capillaries present although not indicated in figure. | |||
Side view of embryo 26 days old , length 1 1 mm , 26—27 myotomes. General outline of body | |||
straighter than in preceding stage. Head projects some 3 mm beyond margin of yolk; tail projects 1.2 mm, | |||
is thinner laterally but broader dorso-ventrally. Eye, ear, nasal pits and mouth well defined. Maxillary | |||
process discernible. Mandibular arches longer, but ventral ends widely separated. Second and third | |||
branchial arches formed. Gill bars present on three branchial arches. Anterior limb buds indicated; faint | |||
anläge of posterior limb buds. Yolk pear-shaped. Heart prominent. First surface capillaries present although | |||
not indicated in figure. | |||
Fig. 28. (X 5.) | Fig. 28. (X 5.) | ||
Side view of embryo 30 days 8 hrs. old, length 13 mm, 30 — 31 myotomes. The trunk of the embryo | Side view of embryo 30 days 8 hrs. old, length 13 mm, 30 — 31 myotomes. The trunk of the embryo is nearly straight. At level of the posterior gill there is a pronounced neck bend and at the level of the posterior limbs a striking downward bend of the tail. The epiphysis shows in surface views. The lens is discernible. The ear is still visible. The external nasal openings are sharply defined. The boundaries of the mouth are better outlined owing to the approximation of the ventral ends of the mandibular arches. The hyoid arch is becoming obscured. The gill bars are prominent on the three branchial arches. The anterior limb buds project dorsally about .5 mm above the surface of the bod3\ The posterior limb buds are but slight elevations. The yolk is pear-shaped with its dorsal surface much flattened. The auricular and ventricular portions of the heart are apparent. The surface of the yolk is covered by a dense network of capillaries which for the most part convey blood antero-ventrally to the abdominal vein. Considerable pigment is present in the trunk region although but little has reached the outer portion of the dermis. | ||
is nearly straight. At level of the posterior gill there is a pronounced neck bend and at the level of the | |||
posterior limbs a striking downward bend of the tail. The epiphysis shows in surface views. The lens is | |||
discernible. The ear is still | |||
the mouth are better outlined owing to the approximation of the ventral ends of the mandibular arches. | |||
The hyoid arch is becoming obscured. The gill bars are prominent on the three branchial arches. The | |||
anterior limb buds project dorsally about .5 mm above the surface of the bod3\ The posterior limb buds | |||
are but slight elevations. The yolk is pear-shaped with its dorsal surface much flattened. The auricular | |||
and ventricular portions of the heart are apparent. The surface of the yolk is covered by a dense network | |||
of capillaries which for the most part convey blood antero-ventrally to the abdominal vein. Considerable | |||
pigment is present in the trunk region although but little has reached the outer portion of the dermis. | |||
Fig. 29. (X 5.) | Fig. 29. (X 5.) | ||
Side view of embryo 36 days 16 hrs. old, length 16 mm, 36-38 myotomes. In general outline the | Side view of embryo 36 days 16 hrs. old, length 16 mm, 36-38 myotomes. In general outline the | ||
embryo shows a | embryo shows a number of striking changes. The neck bend is not so pronounced. The tail bend is scarcely noticeable. There is a striking increase in dorso-ventral width of tail. The cerebral hemispheres are well defined. The eye is now prominent and the lens better defined. The ear is no longer visible in surface views. The mouth is well defined. The ends of the mandibular arches are closely approximated but not united. The hyoid and branchial arches are more obscure. Anlagen of gill fiiaments present on gill bars. Anterior limbs project dorsally. Posterior limbs are short ridges extending in horizontal plane. The yolk is elongated and reduced in diameter both dorso-ventrally and laterally. Surface blood vessels as in preceding stage, excepting that they are now apparent in the gill bars. The chromatophores are most numerous in the anterior and dorsal portions of the head. | ||
scarcely noticeable. There is a striking increase in dorso-ventral width of tail. The cerebral hemispheres | |||
are well defined. The eye is now prominent and the lens better defined. The ear is no longer visible in | |||
surface views. The mouth is well defined. The ends of the mandibular arches are closely approximated | |||
but not united. The hyoid and branchial arches are more obscure. Anlagen of gill fiiaments present on | |||
gill bars. Anterior limbs project dorsally. Posterior limbs are short ridges extending in horizontal plane. | |||
The yolk is elongated and reduced in diameter both dorso-ventrally and laterally. Surface blood vessels | |||
as in preceding stage, excepting that they are now apparent in the gill bars. The chromatophores are | |||
most numerous in the anterior and dorsal portions of the head. | |||
Fig. 30. (X 5.) | Fig. 30. (X 5.) | ||
Side view of einhryo 40 days 20 hrs. old, length 18 mm, 44—46 myotomes. The outline of the body shows a marked ventral curvature of the trunk, less pronounced neck bend, and further increase in the dorso-ventral width of the tail. The eye is very prominent owing to the pigment in the retina. Ear not visible externally. Nasal openings very small. The mandibular arches have coalesced. The boundaries of the other arches are no longer discernible. Gill filaments well developed. Anterior limbs about i mm long project dorso-posteriorly. The yolk is elongated oval. Abdominal vein and branchial blood vessels prominent. Pigment present in dorsal portion of head, also along dorsal and lateral portions of trunk and tail. The yolk is unpigmented excepting along dorsal margin. | |||
Fig- 31. (X 5.) | |||
Side view of larva 49 days old, lergth 21 mm. General outline of body decidedly different. Head bend obliterated, slight upward curve in trunk. Tail broader. Eye more deeply pigmented. Gill bars very long, extending to level of end of anterior limb. From three to five lateral filaments on each gill bar. Anterior limbs project postero-ventrally ; three digits formed. Posterior limbs directed caudad ; no trace of digits. Yolk much elongated. Network of capillaries denser. Large lateral arteries, at level of upper margin of yolk, very prominent. Well defined longitudinal bands of pigment. | |||
Side view of larva 49 days old, lergth 21 mm. General outline of body decidedly different. Head bend obliterated, slight upward curve in trunk. Tail broader. Eye more deeply pigmented. Gill bars very long, extending to level of end of anterior limb. From three to five lateral filaments on each gill bar. | |||
Anterior limbs project postero-ventrally ; three digits formed. Posterior limbs directed caudad ; no trace of | |||
digits. Yolk much elongated. Network of capillaries denser. Large lateral arteries, at level of upper | |||
margin of yolk, very prominent. Well defined longitudinal bands of pigment. | |||
Fig: 32. (X 5.) | Fig: 32. (X 5.) | ||
Side view of larva 61 days old, length 25 mm. General outline of body shows less dorsal curvature of trunk. Tail much longer in proportion to length of trunk and much broader dorso-ventrally. Gill bars longer, each posessing six to eight lateral filaments. Anterior and posterior limbs directed postero-ventrally. Anterior 3 mm long, posterior 2 mm long. Each limb shows four digits. The distribution of pigment is essentially similar to that observed in the 21 mm larva, the bands however are more sharply defined. Chromatophores in the gill bars and limbs and beginning to extend over the dorsal surface of the yolk. | Side view of larva 61 days old, length 25 mm. General outline of body shows less dorsal curvature of trunk. Tail much longer in proportion to length of trunk and much broader dorso-ventrally. Gill bars longer, each posessing six to eight lateral filaments. Anterior and posterior limbs directed postero-ventrally. Anterior 3 mm long, posterior 2 mm long. Each limb shows four digits. The distribution of pigment is essentially similar to that observed in the 21 mm larva, the bands however are more sharply defined. Chromatophores in the gill bars and limbs and beginning to extend over the dorsal surface of the yolk. | ||
Line 375: | Line 277: | ||
==Reference== | ==Reference== | ||
{{Ref-Eycleshymer1910}} | |||
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Eycleshymer AC. and Wilson JM. Normal Plates of the Development of the Salamander Embryo (Nectürüs maculosus). Vol. 11 in series by Keibel F. Normal plates of the development of vertebrates (Normentafeln zur Entwicklungsgeschichte der Wirbelthiere) Fisher, Jena., Germany.
Online Editor |
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This is the eleventh volume by Eycleshymer and Wilson published in 1910 in the series Normal Plates of the Development of Vertebrates edited by Franz Keibel.
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding. (More? Embryology History | Historic Embryology Papers) |
Normal Plates of the Development of the Salamander Embryo (Nectürüs maculosus)
Normentafeln zur Entwicklungsgeschichte der Wirbeltiere by Franz Keibel
By
Albert C. Eycleshymer and James M. Wilson.
St. Louis University, St. Louis Mo., U.S.A.
With 3 Plates.
Jena,
Verlag Von Gustav Fischer.
1910.
Preface
The preparation of the normal tables and plates on Nedurus was begun several years ago by Professor C. O. Whitman but on account of unavoidable circumstances the work was delayed. It was later taken up by Professor Eycleshymer upon the suggestion of both Professor Whitman and Professor Keibel. While Professor Whitman has not directly participated in the later work, he has furnished the senior author with material and Information without which it would have been impossible to complete the work. In the completion of the work the senior author has been fortunate in having the able Cooperation of Professor James M. Wilson.
Table of Contents
Description of lllustrations
The series of eggs, embryos and larvae of Necturus, from which the following descriptions and the appended illustrations were made, were collected May I5th, 1903 and kept at a water temperature of 17o — 18o C. The illustrations are copied from the original water colored pictures which were made by Mr. Leonard H. Wilder, under the direction of the senior author. It should be emphasized that the ages, measurements and illustrations are all made from the living objects.
Note - Magnifications refer to original print versions.
Plate 1
Plate 2
Plate 3
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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding. (More? Embryology History | Historic Embryology Papers) |
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Reference
Eycleshymer AC. and Wilson JM. Normal Plates of the Development of the Salamander Embryo (Nectürüs maculosus). Vol. 11 in series by Keibel F. Normal plates of the development of vertebrates (Normentafeln zur Entwicklungsgeschichte der Wirbelthiere) Fisher, Jena., Germany.
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