Talk:Paper - 1917 The Typical Form of the Cochlea and Its Variations
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Table I. — The Cochlea of Mammals
Correlation Coefficients (from K. Pearson's formula). 51 or 52 organs (42 for the length of the basilar membrane).
| Diameter of the lowest whorl. | Length of the basilar membrane. | The number of whorls. | |
|---|---|---|---|
| Diameter of lowest whorl | •954 ± •009 | •088 ± •092 | |
| Diameter of second whorl | •970 ± •006 | •931 ± •014 | •070 ± •092 |
| Length of the basilar membrane | |||
| Major axis of the oval window | |||
| Diameter of the tube of cochlea | |||
| (Diameter of second whorl/Diameter of first whorl) Per cent. |
•970 db •963* ± •954 db •914 db •806 db
•006 •008 •009 •015 •033
•417 d= '077
•954 db
•009
•931 ±
•014
•070 ±
•092
—
•155 db
•101
•812 ±
•035
•035 ±
•094
•760 ±
•044
•195 ±
•090
•349 db
•091
•000 ±
•094
- For the length of basilar membrane in the first two whorls. —
(1) r for diameter of tube of cochlea to major axis O.W. = '828 ± '030; (2) r for diameter of lowest whorl to length of head and body = '864 dr *024.
Table II The Cochlea of Birds
(17 Organs)
| Length of tube of cochlea. | Diameter of tube of cochlea. | |
|---|---|---|
| Major axis of oval window | •754 ± •070 | •600 ± •104 |
| Diameter of tube of cochlea | •508 ± •121 |
Table IV.
No.
Animal.
Index of
basilar
membrane.
No. of whorls.
Absolute length of
basilar membrane.
Ranking
of
basilar
membrane.
20 18 39 37 47 12 2 29 5 19 17 16 3
31
13
35 7 4
38 9
25
51
52
45
10
22 8
49
21
26
46
30
23
42 1
28
32
41
24
27 43 40 44
Common Weasel
Mongoose
Py oara ,.,«..«.»,,..,,
Hairy-footed Jerboa ............
Vulpine Phalanger
Yellow-faced Baboon
Common Pig.
Iloeheur Monkey ..................
Offpr
Aard Wolf
Three-toed Sloth
Common Rat.
Common Marm oset
Green Monkey
Common Squirrel.
Slow Boris,
Beisa Antelope
Brush-tailed Phascologale
Short-nosed Bandicoot
Brush-tailed Wallaby ............
Indian Fruit Bat
Common Seal .....................
Mongoose Lemur
Pouched Jerboa Mouse
Crab-eating Racoon
Indian Gazelle
Black-faced Kangaroo
wX DC **•«*«**• *«»•***#* »»* * * » »#* •»* »**
G-rey Seal Whale Dromedary .., Tamanduan Anteater Common Mole Cape Sea Lion Common Sheep Porpoise. ............... ..............
Hedgehog
Sea Cow.,,.. .
- 9 » * * * • i
»**»»»
- »#»'*«*<
8*16
7-86
3
7'34
4-i
7*08
9A 4%
6*92
£>4
6*55
O4
6*47
3|
6*40
«*A ®'2
6-37
93
- 4
6*35
3
6 *34
04
6*16
U4
6-12
93
5*93
QA.
5*82
Ql O4-
5'80
4U4
5 "69
9 3 "4,
5-66
98 -"4
5 *60
93 ^4
5-52
2±
5 *47
24
5*43
2i
5*43
2*
5*38
3
5*34
2
5*31
ol «4
5*28
2i
5*25
i 3 A 4
5*25
2|
5*24
21-
5*22
93 ^4
5*18
21
5*18
2
5*11
2
5*10
Z4
4*90
9ii ^4
4*89
2
4*65
If
4 *65
^4,
4*26
2*
4-21
i-4 .
3*97
1|
3*95
X2
mm.
20 *4
10
27*5
17
51 *4
37
17*7
7
27*7
18
52*4
40
08 *o
31
35*2
25
36*6
27
25 *4
13
44 *4
35
38*5
30
36*7
28
32*6
24
52*4
27
14*5
4
25*6
14
29*7
20
18*2
8
20*7
11
41*0
32
J.O
5
lo *o
5
24*2
12
18*7
9
53*1
41
26*4
16
10*5
2
31*5
23
36*7
28
31*3
22
46*6
36
51*8
39
104 *7
42
42*1
34
51*4
37
25*7
15
9*3
1
27'9
19
29*8
21
35*8
26
11*9
3
41 *5
33 ++++++++++++++++++++++++++++++
Table V.
No.
Animal.
Index of
basilar
membrane.
63
74
71
68
70
72
58
64
60
59
57
56
54
66
67
62
73
Sparrow Hawk
Song Thrush
Slender-billed Cockatoo
Crowned Crane
Crowned Pigeon
Burrowing Owl
Cape Grannet
G-reat Tinanio u
Night Heron
Cormorant
Red-throated Diver
Apter yx
Ostrich
Red Grouse
Porphyria
Buzzard
Carrion Crow
4*0 3-5 3-3 3-0
3 3 3 2 2 2
0
•0
'75 66
57
2-57
2-5
2'4
2-33
2*28
2*25
2-0
Table III. Cochlear Indexes
(Index = any dimension divided by the diameter of the lowest whorl.)
Basilar membrane.
Tube of the cochlea.
Major axis of oral window.
Second whorl.
i Number of whorls
•780 ± -040 (- -042 ± -110)* •494 ± -077 - '069 ± '102 •325 ± -101
•060 ± -093 •500 ± '070 •362 ± "082
•051 db '094 •094 ± '093
•000 ± -093
j Second whorl ;
! Major axis of oval window ... j Diameter of tube of cochlea . . .
- Between the number of whorls and the index of the basilar membrane contained in the first two whorls.
