Measurements of Sthenoteuthis meg apt era and S. pteropus (in inches). 
S. megap- 
tera. 
N. Scotia. 
S. pter- 
opus. 
Bermuda. 
S. megap- 
tera? 
Sable I.Bk. 
Length, tip of tail to end of dorsal arms, 
“ tip of tail to end of 3d pair 
25-5 
27-5 
295 
“ to end of tentacular-arms, . 
43 
“ to base of arms, . . 
19 
20-5 
From base of arms to mantle, 
5 
6-25 
Tip of tail to edge of mantle (above), . . 
14 
14‘75 
“ “ “ (below), 
13 
145 
Tip of tail to center of eye, 
18-5 
Length of caudal fin (tip to insertion) 
G 
6-75 
Breadth of caudal fin. 
13-5 
1 1 -25 
Breadth between lateral insertions 
2-33 
2 
End of body to outer angle of fin, 
7 
7-25 
Front edge of fin, from outer angle to insertion, 
6-5 
5-5 
Circumference of body, . _ . . . 
12-5 
11-5 
Breadth of body, . . . . . . 
5 
4-75 
Breadth of head, _ _ 
4 
3 + 
Diameter of eye-opening (longitudinal), .. 
1-25 
1-75 
“ “ (transverse), 
•75 
1-25 
Length of tentacular-arms. . 
24 
Length of dorsal arms, (1st pair,). 
6-5 
7-25 
“ subdorsal “ (2d pair,) 
8 
8-75 
“ subventral “ (3d pair), 
8-5 
9-25 
“ ventral “ (4th pair.) 
8 
9-25 
Breadth of 1 st pair of arms, at base, 
*75 
*75 
“ 2d “ 
1-12 
•80 
“ 3d “ 
1-00 
■90 
“ 4th “ 
D00 
•90 
“ tentacular-arms, 
•33-50 
40-75 
“ terminal club of same, 
•75 
Length of siphon, in middle, 
Breadth of siphon, at base, .. 
2-5 
2 
Breadth of aperture of siphon, 
-- 
i 
Details of tentacular -arms : 
Length of ‘ club,’ or expanded part, 
6-5 
“ part bearing large suckers, 
“ ‘ wrist.’ bearing smaller suckers. .... .. 
325 
1-25 
“ tip, with small suckers, 
1-50 
Breadth of ‘club,’ in middle.. 
*75 
.. 
“ middle of arm, . 
•50 
Details of suckers: ■ 
Diameter of largest suckers of tentacular-arms, 
•40 
rims of same, 
•32 
“ largest suckers of dorsal arms. ... 
•28 
“ rims of same, 
•20 
“ largest suckers of 2d pair . 
•40 
“ rims of same. . . 
•28 
“ largest suckers of 3d pair, 
■32 
“ rims of same, 
“ largest suckers on ventral arms. 
__ 
■24 
•40 
•30 
“ rims of same, 
•32 
•22 
Jaws : 
Upper mandible — total length, 
“ “ tip of beak to bottom of notch, .. 
1-16 
1-68 
1-25 
•40 
•40 
•34 
“ “ tip to dorsal edge of frontal lamina, 
1-32 
•98 
“ “ breadth between anterior lobes of alae, 
•32 
•32 
•25 
“ “ breadth of palatine, 
.. 
•84 
•70 
Lower mandible — total length, . 
.. 
116 
•91 
“ depth, end of alae to mentum, 
-- 1 
1-12 
•87 
“ “ beak to notch 
.. 1 
•44 
■31 
