﻿SAXICAVA.— Plate II. 



The spiniferous Saxicava. Shell small, smooth, 

 square above, two-lobed below ; anterior side 

 very short, umboes terminal, ventral margin 

 deeply excavated ; posterior side broad, truncated, 

 dorsal margin and obliquely decurrent angle 

 ornamented with sharp prominent spines. 



SOWERBT. 



Hob. Savannah Bay. 



The young of Saxicava ai-ctica, rujosa, and Australis 

 are spinose on the dorsal margin and posterior angle, 

 but no specimen of either has been found with spines 

 so prominent, or similar to this in other characters. 



Species 13. (Mus. Deshnyes ? copied.) 

 Saxicava similis. Sax. testd cuneiformi, oblonga, 

 radiatim striafd, posticc hiangulatd, ad angulos 

 carinis subspiniferis duabus munitd ; valvd dextrd 

 majori, ventricosd, valvd sinistra planiusculd ; 

 latere antico angusto, brevissimo ; umbonibus termi- 

 nalibus ; latere 2>ostico expanse, ad ierminum late 

 truncato. 

 The similar Saxicava. Shell cuneiform, oblong, 

 radiately striated, posteriorly biangular, 

 strengthened at the angles by two subspiniferous 

 keels; right valve the larger, ventricose, left 



valve rather flatter; anterior side narrow, very 

 short ; umboes terminal ; posterior side expanded, 

 broadly truncated at the end. 



Deshayes. Mollusques de I'lsle de la Eeunion. 



Hub. Isl. Bourbon. 



M. Deshayes likens this little species to Saxicava 



arctica, from which it differs in being radiately striated 



and in the keel-like ridges on the angles. 



Species 14. (Mus. Brit.) 



Saxicava rrp.puuASCENS. Sax. testd elcmgatd, angiistd, 

 recta, concentrice rugatd ; latere antico brevissimo, 

 umbonibus j)ro}ninentibus terminalibus ; latere pos- 

 tico purpurea svffuso, elongate, oblique angulato ; ad 

 angidum et infrd, marginem dorsalem rugoso, 

 carinato. 



The rur.PLisH S.^xicava. Shell elongated, narrow, 

 straight, concentrically wrinkled ; anterior side 

 very short, umboes prominent, terminal ; posterior 

 side suffused with purple, elongated, obliquely 

 angular ; with a wrinkled keel on the angle, and 

 below the dorsal margin. 



SowERBT. Proc. Zool. Soc, 1834, p. 88. 



Hab. ? 



