CEPHALOPODA FROM THE CALCUTTA MUSEUM. 9 



The pen is lanceolate; narrow anteriorly, it broadens out to a thin blade behind 

 (fig. 31). 



In the male the left ventral hectocotylized arm is somewhat sickle-shaped (figs. 29 

 & 32). The upper outer edge is developed into a wide lateral membrane [l.m. fig. 33), 

 and the suckers are more modified than in Steenstrup's species (7), the upper row being 

 reduced to mere papillae, and the lower row having almost entirely disappeared (fig. 33). 



OIGOPSIDA. 



Family ONYCHII. 



Abralia andamanica, n. sp. (PL 2. figs. 38, 39, 40, 41, 42, 43, 44, & 45.) 



Three specimens, captured at a depth of from 188 to 320 fathoms in the Andaman 



Sea, belong to this species. The following are the measurements of the largest specimen, 



a female (fig. 38) : — 



Length of the mantle (lower surface) 3"8 centim. 



„ from mantle-edge to base of arms . . . 1"2 „ 



,, of attachment of fins 2'3 „ 



„ from mantle-ajDcx to angle of fin ... 2*7 ,, 



Bi-eadtli of combined fins 3'4 „ 



Length of dorsal arm 1-7 „ 



„ dorso-lateral arm 2 „ 



„ ventro-lateral „ 1*8 „ 



„ ventral „ 2 „ 



„ tentacular „ 4 „ 



club -8 „ 



Length of pen of a male, 2'4 centim., breadth 35 centim. 



The mantle is nearly conical, tapering gradually to the apex. At the free edge there 

 is no pronounced dorsal point, but there is a small projection on each side of the funnel 

 (figs. 38 & 39). The fins, rhomboidal in shape, reach about halfway np the mantle ; 

 their posterior edge is slightly concave, their anterior convex and more rounded. 



The head is large, and fits closely on to the edge of the mantle. At the edge of the 



eyelid is a rudimentary sinus. On each side of the neck are two olfactory crests, the 



smallest being nearest the siphon. There is a well-developed valve in the funnel ; and 



the socket at the base of the latter is l-shaped. The buccal membrane has 8 lobes ; its 



nner surface is covered with pajiilte of considerable size. 



The first and second pairs of arms have a median external keel, and a small lateral 

 membrane on the upper edge. The third, or ventro-lateral, pair has a large membranous 

 keel {k, fig. 38), and a membrane along the lower edge. The ventral arms have the 

 outer and upper edge drawn out into a lateral keel. 



All these arms bear two row^s of hooks for about three fourths of their length, and two 

 rows of suckers on the distal quarter. On the ventral arm, for instance, 14 hooks and 



SECOND SERIES. — ZOOLOGY, VOL. VII, 2 



