58 CATALOGUE OF CEPHALOPODA. 



blo, seven-lobed, without cups.— Body elongate, cylindrical, very 

 long, acuminated behind, truncated, square in front. Cartilages 

 on°base of siphuncle, contracted below and with a tubercle 

 on each side, on inside of mantle enlarged, thick, and with 

 transverse rib below. Fins posterior, terminal, very broad, 

 tO"-ether forming a transverse rhomboid. Aquiferous pores be- 

 tween the third and fourth pairs of arms ; four buccal pores, one 

 on each side of the base of the first pair, and one on each side 

 between the third and fourth pair, communicating with a large 

 cavity which surrounds the mouth ; two anal pores on^ each 

 side of the siphuncle, outside of the external band. — Sessile 

 arms conical, subulate, upper and lower quadrangular, the others 

 triangular, compressed, unequal ; in the following order, 3, 2, 

 1, 4°; cups very oblique, fleshy, distinct; rings oblique, 

 toothed. Tentacular arms not retractile, short, strong, thick, 

 with a slight longitudinal ridge, scarcely enlarged at the end, 

 webbed at the tip ; cups oblique, fleshy, in four alternate lines, 

 two middle series large, two lateral small, with a rounded basal 

 and apical group of small sessile cups.— Siphuncle lodged in a 

 cavity, short, broad, with superior medial bands, and an internal 

 valve above. — Shell horny, flexible, as long as the body, narrow, 

 gradually wider above, w'ith a central and two marginal ribs ; 

 apex with a hollow conical cavity, without any septa. 



Living in the high seas in large troops, nocturnal ; the food of 

 Cetacea and pelagic birds. 



Calamar flesches Blainv. Diet. Sci. Nat. 1823. 



Cycria Leach, MS. 1817. 



Ommastrephes D'Orb. Moll. Viv. et Fos. i. 412. 1845; Desh. in 

 Lamck. Hist. xi. 239; Gray, Proc. Z. Soc. 1847, 206. 



? Peroteuthis Ehrenb. 



Loligo sp. Lamck., Riippell. 



Sepia sp. Linn. 



Onychoteuthis sp. Minister. 



§ Body opaque, fleshy, smooth above and below. Cups of sessile 

 Arms equal, moderate. 



* Second and third Pairs of sessile Arms without any membra- 

 naceous Fringe on the inner Edge of the ventral Side, but only 

 a Sei'ies of small conical Tubercles. 



f The tentacular Arms with eight Rows of numerous small Cups at 



the End near the Tip. 



1. ChlMASTREPHES SAGITTATUS. 



Head large. Body elongate, cylindrical. Fins broad, together 

 rhomboldal. Sessile arms thick, long ; rings of cups variable. 



