234 A. E. Verrill — North American Cej)halopo(ls. 



The month is snrronii<le<l by a broad buccal membi-ane, with six 

 angles or lobes, but without suckers. The body is relatively short, 

 with short bilobed caudal fins. The eyes are large, and have distinct 

 lids. The dorsal bone or pen is thin, short, lanceolate, and somewhat 

 quill-shaped, with long, lateral expansions. 



The species, so far as known, are brilliantly colored, having occel- 

 lated spots on raised verruca^, in addition to the ordinary coloration of 

 squids. 



The two foi-eign species, hitherto described, are both from the 

 Mediterranean. 



Histioteuthis Collinsii Ven-iu. 



American Journal of Science, vol. xvii, p. 241. March. 1879. Tryon, Manual of Con- 

 chology, i, p. 166. 1879 (description copied from the original). 

 PL.A.TES XXII and XXYI. 



A large and handsome species, with the broad, thin, dark brown 

 "web, extending between and nearly to the ends of the six upper arms. 

 The outer surface of the head and arms is covered with large, 

 slightly raised warts or tubercles, which are dark blue with a whitish 

 center, specked with brow^i ; three I'ows extend along the ventral 

 arms and two along the others ; a circle of these surrounds the eye- 

 lids, but the edges of the eye-lids are narrowly bordered with dark 

 brown. Color, between the warts, pale purplish brown, with small, 

 raised, dark brown spots, reddish specks, and white granules; web 

 and inner surface of arms uniform dark reddish or purplish l)rown ; 

 suckers yellowish white, their pedicels specked with brown ; tentacu- 

 lar-arms light orange-brown. Eyes mutilated ; their lids form a large 

 simple, rounded opening. 



Tentaciilar-arms slender, about two feet long and expanding near 

 the end into a broad, long-oval, sucker-bearing portion or 'club,' which 

 is bordered by a membrane, widest on the upper edge ; it ends in a 

 tapering tip, on the back of which there is a thin, crest-like membrane 

 or keel, enlarging proximally to its end, where it forms a rounded 

 lobe. The most expanded portion of the ' club' bears six rows of suck- 

 ers, with finely serrate horny rings ; the two central rows contain much 

 the largest suckers, four or five in each ; the more central of these tAvo 

 rows contains four suckers, larger than the rest, and of these the two 

 median are largest ; outside of these two median rows, are two regular 

 marginal rows of nearly equal, mediinn-sized, serrate suckers, on the 

 upper edge ; and along the lower edge of the club there is one row of 

 few, similar, but smaller ones ; outside of these there is an incomplete 



