DIONE.— Plate X. 



gibbosiusculd, pallide spadiced, ad umbones rosea i'mctd, 

 concentrice dense sericeo-striatd, margiue postwo ob- 

 tuse tiimido-aiigidato, umbonibiis incurvis. 



The striated Dione. Shell orbicularly wedge-shaped, 

 solid, rather giblrous, pale fawu-colour, tinged with 

 rose at the umljoes, concentrically densely silk-stri- 

 ated, posterior margin obtusely tvunidly angled, um- 

 boes incurved. 



Cliione striata. Gray, Anal. vol. viii. p. 306. 

 Dione cltrina, var. Deshayes. 



Hah. Philippine Islands ; Cuming. 



A comparison of the above description with that of 

 the preceding species will show that they differ in detail 

 throughout. 



Fig. 45. (Mus. Smithsonian Institute of North 



America.) 



This shell, from Cape St. Lucas, Xantus, California, 



kindly placed in my hands by Mr. Cai-penter, as being 



probably undescribed, proves to be the Diove prora 



{Cytherea prora, Conrad) of our preceding Plate. 



