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 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

»**»»»

• 1. • »#»'*«*<

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

++++++++++++++++++++++++++++++