CARIXARIA. 95 



Genus FIROLOIDEA, Lesucuv. 



Tentacles distinct, subulate; eyes large. Body cylindrical, 

 eliding behind in a short tail usually divided into a rounded 

 upper, and a pointed lower, lobe; nucleus small, situated 

 towards the binder part of the body ; gills indistinct or 

 rudimentary. Ventral fin without a sucker. 



Shell none. 



Syn. Cerophora, D'Orbigny. 



Ex. F. Lesueurii, D'Qrbiyny, pi. 09, fig. 8. 



In this genus the nucleus is placed far behind, the tentacles 

 are developed, and there is no sucker on the ventral fin ; the 

 caudal appendage, moreover, is usually short, and furnished 

 with fin-like lobes. The species inhabit the Atlantic Ocean. 



Specie3 of Flroloidea. 



aculeata, Lesueur. Gairnardii, D'Orb. 



Eydouxii, Gray. Lesueurii, D'Orb. 



Genus CARINARIA, Lamarck. 



Tentacles distinct, slender, elongated ; eyes large, on the 

 sides of the head. Body smooth or granulated, gelatinous, 

 semi-pellucid, large and fusiform, ending behind in a laterally 

 compressed, pointed tail or caudal fin ; nucleus pedunculated; 

 gills pinnate, exsertcd, and protected by a shell. Ventral fin 

 semicircular or subtrigonal, and furnished with a distinct 

 marginal sucker. 



Shell thin, hyaline, glassy, symmetrical, conical, com- 

 pressed, with a recurved apex, a minuto dextrally-spiral 



