34 ONYCHOTEUTHID^. 



Species of Ancistroteuthis. 



Dussumieri, D'Orb. Krohnii, Verany. 



Lichtensteinii, Ferus. 



Genus ONYCHIA, Lesueur. 



Tentacular arms with hooks. Sessile arms with cups 

 and rings. Club of tentacular arms with hooks on the 

 centre, and with two rows of small cups on each side. 



Shell lanceolate, pennate. 



Ex. O. platyptera, U'Orbign^, pi. 3, fig. 6. Shell, 

 O. platyptera, fig. 6, a. 



In Onychia the body is red and spotted ; the tentacular 

 arms are scarcely enlarged at the ends. Like most other 

 genera of this family, and other pelagic forms, it is crepus- 

 cular, darting along the surface of the ocean towards night- 

 fall, and preying upon small fishes, floating Crustacea, and 

 acalephse that swim near the surface. 



Species of Onychia. 

 cardioptera, Feroti. platyptera, D'Orb. 



Genus OMMASTKEPHES, D'Orbigny. 



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. 



Ew. O. Bartramii, Lesueur, pi. 4, fig. 1. Shell, 0. Bar- 

 tramii, fig. 1 , a. 



The sessile arms have two rows of suckers, and some- 



