OF CONCHOLOGY. 193 



DESCRIPTION OP A NEW SPECIES OP SEPIOTEUTHIS 

 PROM THE WEST INDIES. . 



BY WM. M. GABB. 



S. OVATA, Gabb. Plate 17. 



Description. — Body broad, compressed ; bluntly pointed be- 

 low ; above, dorsal margin with a rounded median point, ventral 

 edge emarginate in the middle, and bearing two short angular 

 projections, one on each side of the siphon. Fins narrow, regu- 

 larly rounded on the margin, most prominent in the middle, and 

 terminating a short distance from each extremity. Siphon broad 

 at the base, flattened and conical, end blunt ; aperture large, 

 internal valve large. Head broad at the base, slightly tapering 

 in advance, supported on a short constricted neck ; eyes large ; 

 mouth small, buccal membrane well developed, without cupules. 

 Sessile arms, the longest about half as long as the body ; the 

 dorsal and second pair very short, the third and ventral pair 

 longer ; third pair nearly twice as long as the dorsal ; formula 

 3, 4, 2, 1 ; counting the dorsal as 1. These arms are laterally 

 compressed, and each bears an irregular, double row of small 

 cupules on a narrow face. Tentacular arms slender, subcom- 

 pressecl, and but slightly dilated at the club. In one specimen 

 one arm reaches to the apex of the body, while the other arm is 

 of about the length of the body, less the head. In another both 

 arms are of about the latter length. This difference is probably 

 due to a partial retraction. The club is angulated on its dorsal 

 face, and bears on the inner side two rows of large cupules on 

 its widest part, which become smaller, crowded and irregularly 

 placed in advance, where there are three or four on a transverse 

 line. Internal plate broad in the middle, regularly curved on 

 the sides, bluntly rounded in advance, and narrow and produced 

 behind ; midrib broad, posterior extremity broadly rounded. 



