402 PROCEEDINGS OF THE ACADEMY OF [July, 



thick and heavy; its anterior margin free, produced forward to a 

 rounded point in the nuchal region, and similarly, but to a much 

 less degree, ventrally; broadly emarginate below the funnel. Fins 

 large; attached along the entire length of the mantle, which they 

 slightly exceed both in front and behind in the specimen furnishing 

 the description (a cf from Wakanoura), though not in the others. 

 Cartilaginous articulations as usual in the genus, large and very 

 prominent. 



Head of moderate size, squarish. Eyes large and prominent. In 

 front of the orbit is a large pore ; behind it the integument is raised into 

 a very prominent crest, bilobate, curved, and somewhat excavated 

 in front, with the "olfactory" pore sheltered- just below its dorsal 

 margin. Funnel very large, very wide at the base and tapering 

 bluntly to a rounded extremity; aperture large and directed down- 

 ward, with well-developed lips and valve; supported above by a 

 fleshy bridle at the base of the funnel groove. 



Arms of moderate length, stout, squarish, unequal; the order of 

 length not constant, but in my best specimens 3, 4, 2, 1 . All the arms 

 are outwardly keeled and provided with a broad marginal membrane 

 supported by numerous transverse fleshy processes having their origin 

 between the bases of the sucker pedicels. The latter is best developed 

 on the third pair and least on the ventral arms. The keel, however, 

 attains its maximum on the ventral arms, where it is developed as 

 a broad, thickened web ensheathing the base of the tentacles. These 

 arms are also furnished with a second less prominent keel running 

 down their inner margins. Suckers large, regularly alternating 

 in two rows on all the arms; horny rings prominent, armed with 

 about 18 to 22 stout acute, curved teeth. 



The hectocotylization affects the left ventral arm of the male 

 after the fashion usual in this genus and in Loligo. The first 19 

 pairs of suckers are normal ; they then become much reduced, and 

 after the 24th pair are supplanted by stout conical papilla?. On the 

 first four or five papilla? the suckers persist, though in a very rudi- 

 mentary way, but soon become entirely obsolete. • The integument 

 on and between the papilla? of the Wakanoura specimen is much 

 folded and lobed, a condition perhaps due to the action of the 

 preservative. 



Tentacles rather short, laterally much compressed and keeled 



on both outer and inner margins. The outer keel becomes expanded 



i a broad fleshy web along the distal portion of the club. The 



soon becomes obsolete and is succeeded by an abruptly 



