248 A. E. Verrill — Worth Americaji Cephalopods. 



what thicker. The few suckers I'ernaiiiing 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 sjDCcimen, preserved in alcohol 

 and sent to me, came from the base of the left ventral arm. It is 

 65'"'" in length ; diameter, from inner to outer surface, not including 

 marginal membrane, 45'""' ; including membrane, 64"'"'. 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""" wide (see section of this arm, Plate 

 XXIV, fig. 8, 6'). The sucker-bearing surface is broad, with a slight 

 marginal membrane along each margin {b, h^) 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 

 szuall 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 8'5™'" in diameter, outside; aper- 

 ture, 5'""'; height of cup, 7™™; length of pedicel, 3'""^ 



The exposed parts of the jaws are black and polished ; their inter- 

 nal laminje are reddish bi'own, becoming translucent yellowish toward 

 the margins. 



The upper mandible (Plate XXIV, fig. 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 I'ar 

 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 ala3 have, eacli, two slight lobes, but are 

 otherwise nearly straight; the ala^ are broader toward the inner end, 

 which is obtusely rounded. 



