Notes on Species of Corbiculadoe. 



217 



Fig. 45. 



The shell is high, inflated, heart-shaped, and slightly inequi- 

 lateral. The anterior side is rounded and the posterior some- 

 what obtuse. The valves are solid, the color of the interior is 

 violet, darker on the margins. The beaks are large and pro- 

 minent, they curve inwardly. The striae are close and irregular. 

 The epidermis is darkish-brown. The hinge is very broad and 

 solid. The lunula is oval and broad, and of the same color as 

 the rest of the shell. 



The specimens from the Tigris, Fig. 45, are apparently the 

 young of this species ; they differ from those 

 from Lake Horns, Fig. 44, in being a little more 

 transverse, less inflated, the striae are more regular 

 and less numerous, the epidermis is green and not 

 brown, and the lunula is less broad and of a lighter 

 color than the rest of the shell ; the main charac- 

 ters are, however, the same. 



Comparing this species with Corb. cor. (Fig. 8) 

 we find that it is much smaller, very much more 

 solid, less transverse, more inflated, and that the 

 hinge is broader and stronger. Young specimens 

 of Corb. crassula are somewhat similar to adult examples of 

 Corb. purpurea (Fig. 26); they are, however, less transverse, 

 more heart-shaped, more inflated, and the hinge is broader. 



Corb. crassula. 



35. CorblCllla Clliuingii, Deshayes. 



Corbicula Cumingii, Deshayes. Biv. Brit. Mus. 228. 1854. 



Prime Cat. 4. 1863. 



Corbicula squalida, Deshayes. 



Corbicula notata, Prime. 



Proc. Zool. xxii. 342. 1854. 

 Biv. Brit. Mus. 233. 1854. 

 Prime Cat. 4. 1 863. 

 Ac. N. S. Phil. Proc. 127. 1861. 

 Prime Cat 4. 1863. 



C. testa ovato-transversa, subaequilaterali, tenui, compressiuscula ; 

 extremitatibus rotundatis ; umbonibus turaidis, prorainentibus, incurvis, 



