A. E. VerriU — North American Cephalopoda. 
409 
bases of the arras. Eyes large ; lids thin and simple, 'without a dis- 
tinct lachrymal sinus. Behind and below each eye there is a long 
(4 mm ), slender, clavate, soft papilla (fig. 1 /'), probably olfactory in 
function. 
The sessile arms are large and, except the ventral, unusually round- 
ed ; the inner sucker-bearing faces are much less differentiated than 
usual, scarcely differing from the other sides in color, and bordered by 
only a slight or rudimentary membrane on each side ; the rounded 
prominences from which the sucker-pedicels arise are also colored and 
not much raised. The dorsal arms are rather long and tapering, but 
much shorter and smaller than the others, slightly compressed and 
with a slight median crest distally. The next pair are similar in 
form and structure, but considerably longer and larger. The third 
pair are much longer and larger, with the outer angles well rounded, 
and a strong median crest extends nearly to the base, but is wider 
distally, where the arms are strongly compressed. The ventral arms 
are considerably longer and stouter than the third pair, and very 
different from all the others in form ; they are strongly compressed 
in the direction parallel with the median plane of the head, and have 
the lower and outer angles well rounded, and the sucker-bearing face 
wide and scarcely differentiated from the lateral faces ; but on the 
superior lateral side there is a wide and thick crest running the 
whole length of the arms, giving them a strongly and obliquely com- 
pressed appearance. The suckers on the ventral arms are smaller, 
fewer, and more distant than on any of the others; those at the bases 
are largest and three or four stand nearly in a single row ; farther out, 
along the middle of the arm, they are distantly arranged in two rows 
and rapidly become small. The left ventral arm shows no signs of 
being hectocotylized ; the right one, however, has lost half its length 
by mutilation. On all the other arms the suckers are regularly and 
much more closely arranged in two rows, and decrease more gradu- 
ally in size from near the base to the tips. 
The suckers on all the arms are similar in form ; they are rather 
deep, narrowed at the rim, slightly constricted above the middle, 
and swollen below, and very oblique at the base ; the pedicels are 
slender and nearly laterally attached ; the horny rims are very deep 
and oblique, and strongly denticulated on the outer or higher side, 
but on all the arms they are smooth on the inner side; the median, 
outer denticles are long, slender, close together; laterally they become 
shorter, broader, acute-triangular and curved forward. On the larger 
suckers the outer teeth are obtuse, but on the distal ones they become 
