Notes on Species of Corbiculadce. 



223 



in which this species is found, but have very little doubt as to 

 its coming from some part of Asia. 



I take much pleasure in the dedication of this species to Dr. 

 Wm. Stimpson. 



41. Corbicula vulgaris, now spec. 



Fig. 55. 



C. testa trigona, subaequilaterali, compressiuscula; latere antico Ion 

 giore, rotundato, postico obtuso ; umbonibus bre- 

 vibus, approximatis, incurvis ; dense et irregu- 

 lariter striata ; epidermide olivacea subnitente 

 induta; lunula laevigata ; pagina interna pallide 

 violacea, ad raargines pallide castanea ; cardine 

 incrassato. 



Long. 27; lat. 25 ; diam. 16 mill. 



Hab.— ? Collect. Prime. Corbicula vulgaris. 



The shell is trigonal, subequilateral, and somewhat com 

 pressed. The anterior side is produced and. rounded, the pos- 

 terior is short and obtuse. The beaks are small and approxi- 

 mate, and they curve inwardly. The striae are fine, numerous, 

 and irregular, more especially so on the posterior end. The 

 epidermis is of a light olive color. The lunula is not conspicu- 

 ous, though lighter than the rest of the shell. The interior of 

 the valves is of a pale violet and light chestnut on the margins. 

 The hinge is broad and curved. 



This species, which comes probably from China, is very 

 closely allied to both Corb. Largillierti and Corb. suloatina. 

 Compared with Corb. Largillierti it is smaller, less inflated, and 

 the beaks are not so large, nor so much swelled, the color of the 

 epidermis also is not the same. 



It differs from Corb. suloatina in being more oblique, and in 

 being transversely much shorter ; the hinge margin is also much 

 more curved. 



