A. E. Yerrill — Worth American Cephalopods. 
273 
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, obliqtte 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 lamelliform 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 verrucse. 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 laminae 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-colored part, as seen by 
transmitted light, has the form of a sharp angular tooth, but its 
