214 



Notes on Species of Corbiculadce. 



Compared with Corb. Lydigiana, the only species to which 

 it is allied, it is less elevated, not so triangular, the stria? are less 

 regular and deeper, and the epidermis is darker and coarser. 



31. Corbicula Lydigiana, Prime. 



Corbicula Lydigiano, Prime. Journ. Couchyl. ix. 355. 1861. 



Loc. sub cit. x. 388., pi. xiv. f. 8. 1862. 

 Prime Cat. 3. 1863. 



Fig. 41. 



C. testa trigona, triangulari, aequilaterali, tumid ula, solidiuscula ; sulcis 

 regularibus ; epidermide viridi-flavescente, nitente 

 vestita, ad umbonesbrunnea; lunula ovato-lanceolata ; 

 umbonibus magnis, tnmidis, obliquis, erosis ; pagina 

 interna violacea ; latere antico panic longiore, mar- 

 gine inferiore arcuato ; cardine crasso ; dentibus car- 

 dinalibus inaequalibus; lateralibus crassis. 



Long. 23; lat. 20; diam. 15 mill. 



Corbicula Lydigmna. Hah. — Siam. Collect. Jay, Cuming et Prime. 



The shell is triangular and equilateral. The valves are not 

 much inflated. The anterior side is somewhat the longer. The 

 beaks are large, raised, and commonly much eroded. The striae 

 are regular, raised, and sharp. The epidermis is polished, it is 

 very variable in color, running from a greenish-yellow into 

 darker tints ; the portion of the shell in the vicinity of the beaks 

 is usually dark brown or blackish. Some specimens exhibit 

 rays of a darker hue, but varying in color and in breadth, pro- 

 ceeding from the umbonal region to the inferior margin. The 

 interior is violet. The teeth are unusually robust, but offer 

 otherwise no distinctive characters. The lunula is well 

 marked, but is not of a different color from the rest of the 

 shell. 



One of our most attractive species, and closely allied to 

 Corb. erosa and Pisidiifoj'mis. 



