CYMBULIIDiE. 55 



between Clio and Pnemnodermon, and consists of but a 

 single genus. 



Grenus TRIPTERA, Quoy and Gaimard. 



See characters of the family. 



Ex. T. columnella, Rang, pi. 6, fig. 6. Shell, T. 

 columnella, fig. 6, a. 



This genus, which was not very fully described by M. 

 Quoy, is the same as the Cuvieria of Rang, the denticulate 

 margin mentioned by the first observer must have been 

 caused by fracture, and the figure in the " Voyage of the 

 Astrolabe " represents the animal without the shell : there 

 are four recent species. 



Species of Triptera. 



columnellaj Rang. rosea, Quoy and Gaim. 



oryza, Benson. urceolaris, M'drch. 



Fam. CYMBULIIDiE. 



Animal globular or ovate. Fins two, horizontal, oppo- 

 site, on each side of the mouth, with a small intermediate 

 lobe. 



Shell cartilaginous, slipper-shaped, rarely wanting. 



This family comprises four singular pelagic genera with 

 membranous or cartilaginous shells, excepting Tiedemannia, 

 which does not appear to possess any membranous enve- 

 lope. 



Genus CYMBULIA, Peron and Lesueur. 



Fins large, rounded, with a small, elongate, interme- 

 diate lobe. 



