A. JE. Verrill — North American Cephalopods. :JG5 



nearly complete. They belong to the common Mediterranean variety. 

 Fragments were also taken at Stations 805-7, 871, 87^, S70, 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 ALLOPOSID.^ VerriiL nov. 



Body thick, obtusely rounded; arms extensively webbed; mantle- 

 edge united directly to the bead, not only by a large dorsal commis- 

 sure, but also by a median-ventral and two lateral longitudinal commis- 

 sures, Avhich 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 02)ening 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 Desmoteuthis^ among the ten-armed cephalopods. 



AllopOSUS Yerrill. 



Amer. Journ. 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 Tremoctopxis. 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. 



