A. E. Verritt — North American Cephalopods. 
355 
than that above it ; the aperture is small, ovate, with a smooth rim ; 
their pedicels are short and laterally attached. In the female the 
corresponding suckers are not only smaller but are differently shaped, 
the basal portion being smaller than the upper portion. The suckers 
of the tentacular arms are very numerous, minute, shallow, cup- 
sliaped, with oblique rims and slender pedicels; they are nearly 
equal and appear to form eight to twelve rows. 
Young specimens, with the mantle less than l‘2 mm in length, can 
scarcely be distinguished sexually by external characters, and are 
not easily distinguished from the young of Eossia Hyatti , of 
similar size. 
One of the original specimens (?) measured, from the base of the 
arms to the end of the body, 46 miu ; length of body, 31 ; of head, 15 ; 
breadth of body, 22 ; of head, 23 ; length of fins, 20 ; of their insertion, 
16; breadth of fins, 10; front edge of fin to edge of mantle, 2*5 ; 
length of free portion of dorsal arms, 16 ; of second pair, 17; of third 
pair, 20; of ventrals, 15; of tentacular arms, 25; breadth of dorsal 
arms at base, 3; of second pair, 3; of third, 3*5 ; of ventrals, 3*5 ; 
of tentacular arms, 3'5; of the terminal portion, 3*75 ; its length, 10 ; 
diameter of the largest suckers of sessile arms, '8 ; length of free 
portion of siphon, 7 mm . 
Measurements of Rossia sublevis and R. Hyatti. in millimeters. 
R.snblevis. 
R. Hyatti. 
Sex 
$ 
$ 
$ 
$ 
Station 
879 
894 
324 
218 
Length of mantle, above 
29 
32 
21 
31 
Breadth of mantle - 
22 
25 
17 
19 
Breadth across head. 
26 
30 
15 
20 
Diameter of eves 
16 
16 
8 
9 
Length of a fin 
21 
24 
11-5 
17 
Length of its base 
17 
19 
10 
12 
Transverse breadth of a fin . 
14 
15 
7 
10-5 
Length to base of dorsal arms* 
45 
47 
31 
45 
“ “ “ third pair 
46 
47 
32 
43 
“ “ “ ventral arms 
41 
43 
26 
39 
*• tip “ dorsal arms 
71 
42 
58 
“ “ “ second pair 
65 
75 
43 
59 
“ 11 •* third pair 
78 
46 
64 
“ “ ventral pair 
61 
74 
42 
60 
Length of tentacular club 
9 
15 
7 
10 
Its breadth 
2*6 
9*9 
3 
2 
2-5 
Diameter of largest suckers of lateral arms 
1.1 
1-5 
.8 
* The lentil to the 1 bases’ of the arras, is from the posterior end of the body to the 
free edge of the basal web, between the arms; that of the third pair is to the edge of 
the web, between the second and third pairs. The measurements are all from well 
preserved alcoholic specimens. 
Traxb. Conn. Acad., Vol. V. 
43 
June, 1881. 
