110 BULLETIN OF THE 



some of them verj' large ; ■with subceutral groups of small, sleiider-pedicelled 

 suckers (or hooks) ; with marginal series of small suckers ; and with several 

 rows of minute suckers covering the prolonged distal face of the club. Con- 

 nective cartilages, on the base of the siphon, long-ovate ; corresponding cartilages 

 of the mantle simple longitudinal ridges. Radula with only five rows of teeth; 

 median tooth tridentate ; inner laterals absent ; outer ones simple, acute. 



Cheloteuthis rapax Verrill. 



Plate III. Figs. 1 - If. 



Head large, with very large eyes ; pupils round. The body is rather short 

 and thick, tapering rapidly backward. The arms are long, and taper to 

 slender tips ; the dorsal ones are smaller and shorter than the others ; the 

 lateral and ventral pairs are nearly equal in length, and about as long as the 

 mantle; the ventral arms are somewhat more slender than the lateral ones. 

 All the arms appear to have borne slender-pedicelled, horny claws or hooks, 

 with strongly incurved points, but only the fleshy parts of these are left, in most 

 cases, and all are gone from the tips of the arms. On the ventral arms these 

 hooks were smaller, and in four rows ; the fleshy portion of these consists of a 

 small rounded head, with lateral expansions on each side, and running up, on 

 the outer side, into an incurved hood, or sheath for the horny claw. On the 

 other arms the hooks were in two rows only, but they were much larger, though 

 of similar form ; in a few cases, on the lateral arms, the horny claws are left. 

 These are strongly compressed, and deeply imbedded in the muscular sheath, 

 so that only the sharp, strongly incurved point projects (Plate III. figs. 1", 1*). 



The tentacular arms (Fig. 1) are long and strong, their length being more 

 than twice that of the sessile arms. The club is rather stout, long, decidedly 

 expanded, and has an elevated, crest-like keel on the distal half of its outer 

 surface ; this keel rises abruptly, at its origin, and is colored on the outer side, 

 but white on the face next to the inner surface of the club. The club is 

 broadest near its base, the distal third is narrow and the tip rounded. The 

 armature is remarkable ; in the middle line there is a row of six medium- 

 sized hooks (a"), followed by two much larger ones situated near the middle; 

 these have lost their homy claws (Fig. 1, a, a') ; series of minute, slender-pedi- 

 celled suckers run along the club, either side of the median line, and beyond 

 the large hooks these rows unite and entirely cover the face of the distal third 

 of the club, there forming about eight rows (Fig. 1, d) ; at the tip there is a cir- 

 cular group of minute suckers ((/') ; toward the base of the club, the lower 

 edge is abruptly expanded and bears a row of five peculiar suckers (Fig. 1, e), 

 having very thick basal processes, which are appressed and directed toward the 

 central line of the club, bearing the suckers on their inner ends, attached by 

 short pedicels ; beyond these there is a triangular marginal group of slender- 

 pedicelled suckers (Fig. 1, c) of about the same size ; other rows of minute pedi- 

 celled suckers (or hooks) occupied the subcentral area, between the marginal 

 ones and the central line, which is indicated by a strong white cord ; the op- 



