File:Keibel1910 fig30-31.jpg

Note - Magnifications refer to original print versions.

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.