Notes on Species of Corbiculadce. 



77 



less drawn up to an angle. The striae are also different, being 

 more obsolete and less regular. The color of the epidermis is 

 not the same. 



24. Corbieula purpurea, nov. spec. 



Corbicula purpurea, Prime in litt. Cat. 4. 1863. 



C. testa ovato-transversa, subtrigona, inflata, sequilaterali ; extremi- 

 tatibus obtusis ; umbonibus parvulis, tumidulis, incur- 26 



vis, approximatis, violaceo maculatis ; regulariter sul- 

 cata ; epidermide viridi, nitente vestita ; cardine incras- 

 sato ; margarita profunde violacea ; lunula ovato-lan- 

 ceolata. 



Long. 20 ; lat. 16 ; diam. 12 mill. 



Sab. — In flumine Tigris, Asiae. Collect. 

 "Wheatley et Prime. 



The shell is transversely-oval, somewhat tri- 

 gonal, inflated, and equilateral. The lateral CorbicuIa p«wea. 

 margins are obtuse. The beaks are small, tumid, approximate, 

 they curve inwardly and are marked with violet. The epi- 

 dermis is green and polished. The striae are regular. The 

 interior is a rich and brilliant violet or purple. The lunula 

 is very distinct, and of a lighter shade than the rest of the shell. 

 The hinge is rounded and somewhat broad. 



The Corbicula violacea is allied to certain forms of Corbi- 

 cula cor, and more especially to those of the young of this 

 species; it is, however, smaller, more equilateral, much more 

 transverse, not so trigonal, the beaks are less full and less 

 raised, and the hinge is less curved, less broad, and less robust. 

 In coloring and in disposition of the striae, the two species are 

 very similar. 



