A. E. Yerrill — Worth American Cephalopods. 2V3 



those of the lateral and ventral arms. The first few suckers (three to 

 five), at the base of each arm, are smaller than those beyond, but 

 increase regularly in size; they have the edge of the rim nearly 

 entire, or with only a few blunt teeth on the outer margin ; then 

 follow about twelve suckers, of the largest size. These large 

 suckers (Plate XXVIII, figs. 5, 5a) are deep, oblique cup-shaped, 

 somewhat swollen in the middle, with oblique horny rims, which are 

 entire on the inner margin, but on the outer have a large, strongly 

 incurved, acute median tooth, on each side of which there are usually 

 four or five shorter, flat, blunt teeth ; but toward the base of the arms 

 these are fewer and shorter, while distally they become more numerous, 

 longer, and more acute, and often the edge is more or less denticulate 

 nearly all around. The larger suckers are followed by a regularly de- 

 creasing series of thirty to forty smaller secondary ones (figs. 6, 6a), not 

 counting the numerous very small ones, within one-third of an inch of 

 the tip. These secondary suckers grade gradually into the large or 

 primary ones, both in size and form ; they are, however, armed with 

 four or five very sharp incurved teeth, on the outer margin, of which 

 the median one is longest, while the inner margin is usually entire. 

 They are very oblique and one-sided in form. The membrane around 

 the rim of all the suckers is thickened, but most so on the basal ones ; 

 it usually recedes behind the large median tooth, leaving there an 

 emargination. 



The outer buccal membrane is not very large ; its inner surface is 

 closely covered with laraelliform folds and wrinkles ; its border is 

 prolonged into seven acute angles, from which membranes extend to 

 the opposite arms, going to the upper sides of the second and fourth 

 pairs of arms ; to the lower side of the third pair ; but the seventh 

 angle is in the median dorsal line, and the membrane from it bifur- 

 cates, one-half going to the inner side of each dorsal arm. Imme- 

 diately around the jaws there is a circular, thickened, rugose oral 

 membrane, with a strongly lobed edge, while its inner surface is 

 radially wrinkled and covered with scattered rounded verrucae. A 

 plain fold intervenes between this and the outer buccal membranes. 



The jaws are sharp and incurved at tip, reddish brown to brownish 

 black in color, with the posterior borders of the laminre whitish and 

 translucent. The upper mandible has a much incurved tip, with the 

 cutting edges regularly curved, and with a shallow notch at their 

 bases, beyond which the anterior edges rise into a broad obtuse lobe 

 or low tooth, by which the hardened and dark-coloi'ed part, as seen by 

 transmitted light, has the form of a sharp angular tooth, but its 



