214 A. E. Verrill — North American Cephalopods. 



or less mnlitated at tlie tips, and several had tluis lost a considerable 

 portion of their length, so that it is quite probable that originally the 

 sub-ventral arms (or third pair) were actually longer than the ventral 

 ones. The circumference of the third pair of arms, when measured 

 by me, was considerably greater than that of the ventral ones ; the 

 former being 11"25 inches; the latter 10 inches. Hence I have 

 inferred that the greatest circumference (17 inches), measured by Mr. 

 Harvey, applies to the third pair of arms. 



The ventral arms have both outer angles bordered by a strong, 

 thick marginal membrane, about an inch wide. The arms are all 

 more or less trapezoidal in form, and taper to very slender tips. 

 When examined by me they had already lost nearly all their suckers. 

 A few remained near the base of one of the arms of the third pair. 

 These were 25""" (1 inch) in diameter, with the aperture 15'5™'" (-62 

 inch) across ; the denticles on the outer border of the marginal ring 

 were broad-triangular, acute, and strongly incurved, much larger 

 than those on the inner margin. 



Of the detached suckers, I have been able to study, with care, 18 

 specimens from the sessile arms. Part of these are represented only 

 by the horny marginal rings. The three largest differ from the rest 

 in having the denticles less incurved and more nearly alike all around 

 the margin, those on the inner edge being only somewhat smaller 

 and more slender than those on the outer margin, while the rings 

 themselves are less oblique and eccentric. These may have come, 

 perhaps, from the ventral arms, near the base. The other suckers all 

 belong to one type, like those seen upon the third pair of arms, 

 described above. They differ, however, very much in size, in the num- 

 ber of denticles, and in the presence or absence of more or less perfect 

 denticles on the inner margin, this, in the smaller ones, often being 

 without any distinct denticles whatever; the horny rings are very 

 oblique and the aperture eccentric. The diameters vary from 8""" 

 to 24'"'" externally; the apertures from 3 •5"'" to 20'"'". 



One of the most perfect of these suckers {h) is preserved in alcohol 

 with the soft parts (Plate XVH, figs. 5, 6), and was sent to me from 

 Newfoundland by Mr. Harvey. This has a greater external diam- 

 eter of 22"""; diameter of aperture, 10'"'"; height of cup (outside), 

 16'""' ; height at center, 15""", height near inner margin, at attachment 

 of pedicel, 6""'"; length of pedicel, 14'"'"; diameter of pedicel, 1-5'"'". 

 In a side-view the sucker is oblique and gibbous ; the lower surface is 

 convex centrally, but has a dee|) notch or pit near the front margin, 

 in the bottom of which the slender but strong pedicel is attached. 



