A. E. Terrill — North American Cephalopoda. 225 
dorsal arms bear, each, about 30 suckers, exclusive of the small ter- 
minal ones. 
The 2 2d sucker of the left ventral arm (Plate XXI, figs. 8, 8a), 
has a strong, somewhat elliptical rim, with 7 strong and very acute 
incurved teeth on the outer side, and with the opposite margin on the 
inner side smooth for more than a third of the circumference. The 
median tooth on the outer margin is decidedly larger and longer than 
the others, and abruptly bent inward above its base. It is elongated 
and gradually tapered to the very acute tip, but thick and channelled 
externally at its base. To the right and left of this are three similar, 
but smaller, unequal teeth, all strongly curved inward toward the 
inner margin, (not convergent to the center). Of these the second 
from the central tooth, on each side, is the largest, and the third is 
the smallest. Between the latter and the smooth inner edge there is 
a small rounded lobe, or blunt tooth. Peduncle broad toward the 
rim, tapering rapidly to the slender base. Outer sides of rim much 
higher than inner. Greater diameter, 10 mm ; lesser, 7 ram ; greater 
interior diameter, 7 mm ; total height, 13 n ‘ m ; longest tooth, 2’5 mm . 
The exposed portion of the upper mandible is black; the point is 
strongly curved, acute, with a smooth cutting edge, separated from 
the inner lobe by a deep, acute notch ; inner lobe or edge of aloe thin, 
broadly rounded, with a slightly rounded, imeven edge. Length of 
mandible, 29 ram ; distance from bottom of notch to tip, 10 mm ; internal 
breadth between lobes, 8 mm . 
The lining membrane of the palate (Plate XXI, fig. 2), is pale, 
translucent, covered with rather large, whitish, translucent teeth, vari- 
able in form and size, but mostly rather broad at base and tapering to 
an obtuse tip; some are more slender and acute. No granules were 
detected on the membrane. 
The odontophore (Plate XXI, figs. 3-7), was too much injured to 
show its general form, but it appeared to resemble that of A. Har- 
veyi. The lateral membrane was broad in the middle, translucent, 
white. No plates outside the lateral teeth could be detected. The 
teeth all have slender, acute tips. The median teeth have three points 
of equal length ; the inner lateral ones have two points, the outer one 
considerably shorter and smaller than the other; the two outer lateral 
teeth are simple, long, acute, the outermost rather narrower at base 
and somewhat longer. 
Total length, 109 cm (43 inches) ; length of body and head, 48*2 cra 
(19 inches); length of body from dorsal edge of mantle, 35'5G cm (14 
inches); from ventral edge, 33T6 cm (13 inches); of head from edge 
Trans. Conn. Acad., Vol. V. 29 Feiirdary, 1880. 
