PHYLLIRRHOIDJL 97 



These animals are very elosely allied to Carinaria, and 

 are found in the Atlantic ; the small, fragile, helicoid shell 

 which protects the nucleus is very rare, and doubtless often 

 escapes observation on 'account of its minute size. The tail 

 in this genus is simple and acuminate, the tentacles are 

 distinct and elongate, and the eyes large, and apparently well 

 developed. 



Species of Cardiapoda. 



carinata, D'Orb. pecluuculata, D'Orb. 



caudina, Bang. placenta, Eyd. and Soxd. 



Fam. PHYLLIRRHOID^. 



Lingual membrane narrow ; teeth in a single, central 

 series ; mouth provided with horny jaws ; tentacles elongate, 

 filiform. Body fusiform, translucent, vertically compressed, 

 ending behind in a fin-like tail ; gills none external. Foot 

 or ventral fin none. Vent at the right anterior side of the 

 body; orifices of the organs of generation on the same side, 

 in front of the vent. Sexes united. 



Pelagian. 



The singular oceanic creatures comprised in this family 

 appear rather to resemble the Heteropods in their general 

 form, structure, and mode of life than the Nudibranchs. 

 They are found swimming at the surface in mid-ocean 

 towards twilight; their progression, slow and steady, is 

 effected by lateral inflections of the body and caudal fin, 

 the elongate, flattened tentacles being extended in a straight 

 line iu front of the head. They have an upper and lower 

 semi-lunar, cutting, horny jaw, and their stomach is fur- 

 nished with elongated ceeca. 



