248 
A. E. VerriU — North American Cephalopods. 
what thicker. The few suckers remaining on them, were attached by 
slender pedicels, and arranged in two alternating rows ; they were 
furnished with horny rims having the edge entire, except where irregu- 
larly broken away; those of the distal part of the arms were gone. 
The portion of the arm of the second specimen, preserved in alcohol 
and sent to me, came from the base of the left ventral arm. It is 
( 35™'“ in length ; diameter, from inner to outer surface, not including 
marginal membrane, 45 mm ; including membrane, 64 mni . It is well 
rounded on the inner face, but more flattened on the upper side, while 
the outer surface is broadly rounded ; the outer angle has a strong, 
thick, marginal membrane, 19 mm wide (see section of this arm, Plate 
XXIV, tig. 8, c). The sucker-bearing surface is broad, with a slight 
marginal membrane along each margin (b, b') rising into broad, flat, 
somewhat thickened blunt lobes alternating with the suckers. Two 
alternating rows of firm, smooth, rather irregular-shaped tubercles, 
run along the median region, between the rows of suckers, with which 
they alternate, on each side. 
This segment of the arm still bears five suckers, which appear to 
represent the 1st, 2d, and 4th pairs, though there may possibly have 
been others before the first of these. They are all similar, rather 
small in proportion to the arm, round, but little oblique, decidedly 
convex beneath, and with a rather long, slender pedicel, (fig. 8, a). 
The horny marginal rings are dark brown, yellowish at the thin edge, 
which is entire and nearly smooth, except where broken. The lar- 
gest of these remaining suckers are S’o"*” in diameter, outside; aper- 
ture, 5 rain ; height of cup, 7 mm ; length of pedicel, 3 rara . 
The exposed parts of the jaws are black and polished ; their inter- 
nal lamime are reddish brown, becoming translucent yellowish toward 
the margins. 
The upper mandible (Plate XXIV r , fi g- 5), has an elongated, tapered, 
considerably incurved and sharp rostrum ; the notch is rather narrow 
and deep, and a well-developed, triangular, lateral groove runs down 
from the notch for some distance, its upper border being in line with 
the cutting edge of the rostrum. The anterior edge of the alae, so far 
as normally exposed, is nearly straight, but slightly undulated. 
The lower mandible (Plate XXIV, fig. 6), has the cutting edges of 
the rostrum slightly concave, with a slight notch close to the tip, 
which is small and incurved ; the notch at the base is broad and 
shallow, bordered externally by a slight, angulated ridge; the ex- 
posed anterior edges of the alae have, each, two slight lobes, but are 
otherwise nearly straight ; the alae are broader toward the inner end, 
which is obtusely rounded. 
