OP CONCHOLOGY. 23 



DESCRIPTION OP A NEW SPECIES OP CEPHALOPOD 

 FROM THE SOUTH PACIFIC. 



BY AVM. M. GABB. 



Onychoteuthis ^iquimanus, Gabb. — Plate 2. 



Description. — Body slender, fusiform, regularly tapering and 

 sharply pointed posteriorly ; mantle margin truncated anteriorly 

 Avith a prominent point in the median dorsal region and two 

 smaller projections on the ventral face, placed each side of the 

 siphuncle ; between these points the margin is concave. Head 

 small, very slightly subquadrate ; eyes moderate in size, 

 bordered anteriorly by a small fold of skin ; lachrymal sinus 

 small. Sessile arms of nearly equal size, and about two-fifths of 

 the length of the body ; formula of relative size, counting from 

 the dorsal side, 2, 3, 4, 1 ; the ventral arms have a small mem- 

 branous expansion on the upper side connecting with the third 

 pair ; cupules small and numerous ; tentacles more than twice 

 the length of the sessile arms, slender ; club narrow, armed 

 with numerous rather small claws ; disc small, with a few minute 

 cupules. Siphon small, hardly projecting beyond the margin of 

 the mantle. Fins nearly half the length of the body, outer 

 angle pointed. Internal plate narrow, widest near the middle, 

 rounded at the upper end, very narrow below and at the point, 

 dilated into a shallow slipper-like termination. 



Dimensions. — Length of internal plate 3 in., width # 14 in., 

 length of terminal cone "05 in., circumference of body of a 

 large specimen 2-45 in., length from margin of mantle to tip 

 of body of same 3-8 in., length of fins 2*1 in., width of fins 2*3 

 in., length of largest sessile arm 1-8 in., length of shortest 1*4 

 in., length of tentacle 3*5 in. 



Observations. — This animal, of which I have two specimens, 

 is said to have been found in the vicinity of the Society Islands. 

 The measurements of the plate are from the smaller of the two 

 specimens ; the external measurements from the larger. They 



