414 A. E. Verrill — JSTorth American Cephalopods. 



but similai- in form, deep cup-shaped, convex in the middle, obliquely 

 attached, with a smooth horny rim, except on the distal ones, which 

 have blunt denticles externally. There are about sixteen of these 

 suckers on each of the lateral arms, but eight or ten are decidedly 

 larger than the rest. The large suckers commence nearly at the mid- 

 dle of the arms and extend to very near the tips. The suckers on all 

 the arms are deep, urceolate, with somewhat contracted apertures ; 

 they mostly have the horny rim entire ; the distal ones on the ventral 

 arms are finely denticulated. The third pair of arms have a thin 

 median carina on the outer side, along the distal third. 



All the arras have a wide marginal or protective membrane along the 

 inner edges, outside the suckers ; these membranes are strengthened 

 by transvere thickened, muscular processes, opposite each sucker; be- 

 tween these the membrane recedes so that the edge is scolloped. The 

 ventral arms have also a membrane along the outer, ventral angle. 

 I am unable to detect any positive signs of hectocotylization, either 

 in the dorsal or ventral arms. Perhaps the presence of the very large 

 suckers on the lateral arms may be a sexual character, but if so, they 

 are symmetrical on the two sides. 



The tentacular arms (PI. LYI, fig. 3) taper from the thickened base, 

 and ill our specimens equal in size, and are not much longer than, those 

 of the third pair; club well developed, rather broader than the rest of 

 the arm, with a dorsal keel and wide, marginal, protective membranes ; 

 the suckers are arranged in four regular rows ; the larger suckers are 

 about equal in size to the larger ones of the dorsal arms ; of these 

 there are eight or nine in each row, the marginal ones are scarcely 

 smaller than the median ones and similar in shape, but more oblique; 

 all these suckers are cup-shaped, obliquely attached, with long pedi- 

 cels; the marginal ring is denticulated all around, the teeth on the 

 outer or higher side being slender, sharp and incurved ; those on the 

 inner side minute. The distal part of the club is short, and covered 

 with four rows of small suckers, similar to the larger ones in shape 

 and armature ; at the tip is a small group of minute suckers, appar- 

 ently unarmed. At the proximal end of the club there is a group of 

 small denticulated suckers; and four irregular rows of minute, con- 

 nective suckers, attached by short pedicels, extend along the inner 

 surface of the arm to the middle or beyond ; these are interspersed 

 with minute tubercles, more distinct distally, near the club. The 

 outer buccal membrane is narrow, without distinct angles. 



The pen is very thin, delicate, pale yellow; the anterioi- ])ortion is 

 very narrow and slender; the posterior third, commencing opposite the 



