Notes on Species of Corbiciiladce. 



65 



respects, however, it is quite different. The Corbicula levius- 

 cula, though larger, is much lighter and more delicate than 

 Corbicula difficilis / it is somewhat more inflated, less transverse, 

 the beaks are less curved, the hinge is much narrower and less 

 strong, the sulci are closer and more regular, the epidermis is 

 different in color and more polished, the color of the interior is 

 not the same, and finally the inferior margins do not present the 

 abnormal appearance peculiar to those of Corbicula difficilis. 



8. Corbicula Malaccana, Deshayes. 



Corbicula Malaccenns, Desh. Proc. Zool. XXII., 343. 1854. Biv Brit. Mus. 229. 



1854. 



Fig.'IO. 



C. testa ovato-transversa, subtrigona, ina3quilaterali, turgidula, soli- 

 dula; umbonibus parvulis, obtusis ; latere antico 

 longiore ; extremitatibus obtnsis ; valvis intus 

 albidis vel pallide violaceo tinctis ; cardine an- 

 gusto ; epidermide subnitente, viridi-flavescente 

 vestita ; sulcis regularibus. 



Long. 27 ; lat. 23 ; diam. 15 mill. 



Hob. — In rivulis ad Malaccara affluenti- 

 bus. Collect. Cuming et Prime. 



The shell is rounded-oval, inequilateral, 

 and not inflated. The sides are obtuse. The 

 beaks are small and not much raised. The 

 interior is white or pale violet. The sulci 

 are light and regular. The epidermis is 

 greenish-yellow and somewhat polished.. The hinge is some- 

 what narrow. 



Compared with Corbicula cor, the Corbicula Malaccana is 

 smaller, less solid, less inflated and less transverse; the beaks are 

 less tumid and the sulci are lio-hter. 



Corbicula Malaccana. 



