52 CAVOLINIDiE. 



>Sy/i. Hyaleea, 5, Rang. 



Ex. D. mucronata, Quo^ and Gaimard, pi. 6, fig. 2. 

 Shell, D. trispinosa, Lesueur^ fig. 2, a. 



This genus consists of those forms which are elongated, 

 with the lateral fissures short, and the appendices pro- 

 duced. They have the same hahits as Cavolina, and are 

 found in all the seas of the torrid zone and in many of 

 those of the temperate zones. 



Species of Diacria. 



depressa, UOrh. mucronata, Quoy and Gaim. 



laevigata, D'Orh. trispinosa, Lesueur. 



Grenus CLIO, Browne. 



Animal elongate, conical, without lateral appendages. 

 Fins expanded, united behind, without any small interme- 

 diate lobe. 



Shell elongate, angular, conical ; mouth larger than the 

 cavity, without any lateral slits. 



Syn. Cleodora, Peron and Lesueur. 



Ex. C. pyramidata, Browne^ pi. 6, fig. 3. Shell, C. py- 

 ramidata, fig. 3, a. 



The shells of the genus Clio are pyramidal and taper- 

 ing, with prominent spines at the fore part ; C. cuspidata is 

 one of the most beautiful of the Pteropods, and is armed 

 with three very long spines. 



Species of Clio. 



pyramidata, Browne. Lamartinieri, Rang. 



cuspidata, Bosc. compressa, Eyd. and Soul. 



deluciana, Rang. Chaptalii, Eyd. and Soul. 



