A, EF. Verrill—North American Cephalopods. 235 
alternating row of much smaller marginal ones. On the lower 
edge of the proximal portion of the club, extending from the middle 
backward, there is a row of four small, smooth-edged, unequal suckers, 
alternating with rounded, sessile tubercles that fit into corresponding 
suckers on the other arm; a row of similar but smaller suckers extends 
for about six inches along the inner surface in the median line of the 
arm, alternating at first singly, and then two by two, with tubercles, 
and gradually becoming more distant. The end of the arm, beyond 
the expanded club, bears minute serrate suckers, at first in six rows, 
decreasing to two toward the end. The extreme tip bears a small 
group of minute, smooth-edged suckers. The largest suckers of the 
club are decidedly constricted below the margin, and then swell out 
at the basal portion. The edge of the horny rim is divided into very 
numerous, small, incurved and crowded denticles, nearly equal in 
length, but part are thickened and obtuse, while the rest are more 
slender and acute. Diameter of the largest suckers, 65"; of the 
largest in the second row, 5°53; of the largest in the lateral rows, 3 
to 4; of the largest smooth-rimmed marginal suckers, 2 to 2°53; of 
the smooth-rimmed suckers of the wrist, 1°5 to 2. 
Sessile arms stout, trapezoidal, tapering to slender tips, and bear- 
ing two rows of numerous suckers. All the arms on the left side are 
an inch or more longer than the corresponding right ones. The dor-~ 
sal and ventral arms, of the same side, are about equal, and decidedly 
shorter than the two lateral pairs, which differ but little in length. 
Web about two-thirds as broad as the length of the arms, uniting the 
upper three pairs together, and as a narrowing border extending 
along their sides, to the tips. The lower lateral arms have a thin, 
crest-like membrane on their outer, median surface, commencing at 
the basal fourth and extending nearly to the tips. The ventral arms 
are united together, toward the base, by a web, which is also joined 
to the main web, in the median plane. A narrow outer web, arising 
from the outer angles of the arms, also unites all the arms together 
for a short distance above their bases. 
The suckers are all similar in form. The larger ones on the dorsal 
arms are, perhaps, a little larger than those on the lateral and ventral 
ones. The largest are subglobular, laterally attached, and gibbous; 
the aperture is small, usually with three or four flat, blunt, or rounded 
lobes or denticles on the outer margin, with none on the inner margin. 
The pedicels of the larger suckers are very stout at base, tapering up 
to their attachment on the lower side of the sucker, where they are 
small and slender. The largest suckers of the dorsal arms are 5™" 
