CRASSATELLA.— Plate II. 



The beaked Crassatella. Shell ovately triangular, 

 beaked, smooth, having the entire surface orna- 

 mented with a number of straight lines diverging 

 from the umbones to the margins, and covered over 

 with a thin brown polished epidermis ; anterior side 

 rounded, posterior more produced and somewhat 

 angular ; interior whitish, and strongly crenulated 

 round the edge. 



Lamarck, Anim. sans vert. (Deshayes' edit.), vol. vi. 

 p. 1 10. Encyclopedie Me'thodique, pi. 253. f. 2. a, b. 



Sowerby, Genera of Shells, No. 3. pi. 1. f. 3. 



Hab. Island of Ceylon. 



The Crassatella rostrata is a very characteristic spe- 

 cies, and the only large one of the genus that is crenu- 

 lated round the inner margin. The shell figured by 

 Chenu under this title in Delessert's ' Recueil de Co- 

 quilles ' may probably be a variety of the Crassatella An- 

 tillarum. Lamarck quotes South America and the West 

 Indies as habitats of this species ; I never, however, 

 heard of this shell coming from either of those localities, 

 having received it, on the contrary, from Ceylon. 



Species 11. (Mus. Cuming.) 



Crassatella jubar. Crass, testd subovatd, valde inm- 

 quilaterd, gibbosd, extits vivide radiatd, radiis ferru- 



ginosis, ab umbonibus, jitbarum similitudine, divergen- 

 tibits ; ad utrumque latus irregulariter multistriatd ; 

 epidermide fused, subquassd, sparsim indutd ; intiis 

 albd, ad extreniitatem posticam brunned ,- umbonibus 

 plicatis, compressis ; latere antico inclinato, rotun- 

 dato, postico arcuato, elongato, aa/minato. 



The sunbeam Crassatella. Shell nearly ovate, very 

 inequilateral, gibbous, and vividly radiated, the rays 

 of a ferruginous brown colour, diverging from the 

 umbones like sunbeams ; transversely striated in a 

 very irregular manner on each side, and covered 

 here and there with a dark bruised epidermis ; in- 

 terior white, brown towards the posterior extre- 

 mity ; umbones plaited and compressed ; anterior 

 side bent and rounded, posterior curved, elongated, 

 and pointed. 



Reeve, Proceedings Zool. Soc, 1842, p. 44. 



Hab. Western coast of New Holland. 



A single specimen of this fine shell was presented to 

 Mr. Cuming a short time since in Hamburgh, having 

 been received by the liberal donor of it from that pro- 

 lific portion of the globe above noted. It exhibits a 

 peculiarity of character very unlike any other species, 

 and is so richly illumined with rays, that I have distin- 

 guished it by the name of " The sunbeam Crassatella." 



