510 ONYCHOTEUTHID^. 



the arms are destitute of lateral interior membranes ; the large arms 

 are thin. 



I have not been able to ascertain whether this species is armed 

 with hooks or suckers. The tips of the small arms, as w^ell as the 

 greater portion of the larger arms, had been cut off by the fisher- 

 men, an ojjcration which they perform upon all they capture, for 

 fear of receiving injury from them. 



Length of the sac ten inches. The figure represents the animal 

 at half its natural size ; it was a female, the oviduct of whicli was 

 exserted and pendant, as represented in the plate ; it is an aggre- 

 gation of small white globules, attached and sustained by a mem- 

 brane. Sandy Bay. (^Lcsucur.y 



Family ONYCHOTEUTIIID^. 



Eyes naked, with a sinus above. Mantle furnished with three 

 internal cartilages, one dorsal and two ventral. Siphuncle with a 

 valve. 



Shell solid, horny. 



The fins are posterior, dorsal, and angular ; the head is moderate 

 and cylindrical ; the eyes naked, with a deep lachrymal sinus at the 

 upper edge ; the ears have a well-marked longitudinal crest ; the 

 tentacular arms have a rounded group of small sessile cups at the 

 extremity of the club ; the shell is internal, horny, lanceolate, and 

 without any air-chambers. These animals are usually termed Squids 

 and Calamarics ; they are gregarious and frequent the open sea of 

 all climates. 



Genus OMMASTREPIIES, D'Orbigny. 1835. 



Tentacular and sessile arms with cups and horny rings. Fins 

 rhombic, posterior, caudal. Internal cartilage of mantle dilated 

 below. 



Shell narrow, dilated in front, with one central and two marginal 

 ribs. 



Onunastrephes sagittatus. 



Plate XXV. Fig. 340. 



Ommastrephes srtrjittafus, Ferussac and D'Orbigny, Hist. Nat. des Ccph. 345, pi. 1, fig. 

 1-10; pi. 4, 6 (1835-1848). — Gray, Brit. Mus. Ceph. 58 (1849). 



