4. E. Verrill — North American Cephalopods. 
-i Go 
nearly complete. They belong to the common Mediterranean variety. 
Fragments were also taken at Stations 865-7, 871, 878, 870, 892, 895. 
The capture of a living specimen, probably of this species, on the 
coast of Xew Jersey, has been recorded by Rev. Samuel Lockwood, 
Amer. Naturalist, xi, p. 243, 1877. 
Family ALLOPOSIDiE Verrill. nov. 
Body thick, obtusely rounded ; arms extensively webbed ; mantle- 
edge united directly to the head, not only by a large dorsal commis- 
sure, but also by a median-ventral and two lateral longitudinal commis- 
sures, which run from its inner surface to the basal parts of the 
siphon. 
The male hectocotylized right arm of the third pair is developed in 
a cavity in front of the right eye and, when mature, protrudes from 
an opening on the inner surface of the web, between the second and 
fourth pairs of arms, and finally becomes detached. It is furnished 
with two rows of large suckers, and with a fringe along the sides. 
The mode of attachment of the mantle to the head is similar to that 
of Eesmoteuthis , among the ten-armed cephalopods. 
AllopOSUS Verrill. 
Amer. Jouru. Sci., xx, p. 393, Nov., 1880; Proc. Nat. Mus., iii, p. 362, Dec., 1880; 
Bulletin Mus. Comp. Zool., viii, p. 112, March, 1881. 
Allied, in some respects, to Philonexis and Tremoctopus. Body 
thick and soft, smooth; arms (in the male only seven) united by a 
web, extending nearly to the ends ; the length of the arms decreases 
from the dorsal to the ventral ones; suckers sessile, simple, in two 
rows ; mantle united firmly to the head by a ventral and two lateral 
muscular commissures, the former placed in the median line, at the 
base of the siphon; free end of the siphon short, well forward. 
In the male, the hectocotylized right arm of the third pair is devel- 
oped in a sac in front of the right eye (Plate L, figs. 1, 1«) ; as found 
in the sac, it is curled up and has two rows of suckers; the groove 
along its edge is fringed; near the end, the groove connects with a 
rounded, obliquely placed, broad, fiat or slightly concave lateral lobe, 
with transverse wrinkles or plications on the inner surface ; the termi- 
nal portion of the arm is a long fusiform process. 
