694 



upper edge sloping ; the external surface is coarsely decussated, 

 the concentric ridges being rather larger at the extremities. 

 British Islands, Mediterranean Sea, and Senegal in Africa. 



53. Tapes denticulata (pi. cl. f. 114), 8owerhj,jun. 



T. testa ovali-subrhomboidea, alta, ventricosa, pallide fulva, 

 griseo obscure maculata et radiata, sulcis radiantibus insequalibus, 

 medio alternatis, et costellis numerosis concentricis ad latus pos- 

 ticum denticulatis decussata ; latere antico subrotundato, brevi ; 

 lunula ovali, griseo-literata ; latere postico oblongo, oblique 

 truncato ; margine dorsali depresso, recto, laminato, subdeclivi, 

 griseo-literato ; margine ventrali subrotundato. 



A deeper and much coarser shell than T. decussata, with a 

 more rounded ventral margin, the riblets denticulated at the back 

 part of the shell, and the radiating grooves unequal and subdi- 

 vided in the middle. The lunule is of an oval form, speckled 

 with grey. 



Locality unknown. In Mr. Cuming's collection. 



54. Tapes Philippinarum (pi. cli. f. 139, 140, 141), A. 

 Adams (Venus), Zool. Voy. Samarang, Mollusca, p. 79. pi. 22. 

 f. 10. 



T. " testa oblongo-ovata, antice truncata, fulva, fusco variegata, 

 obscure radiata, radiatim lirata, liris numerosis, subundulatis, ad 

 latera decussatim nodulosis ; intus partim violacea." 



Formed like T. Indica, but with the apex nearly terminal, so 

 as to give the front part of the shell a truncated appearance ; the 

 radiating grooves are unequal, some of them angulated and flat- 

 tened. The area of the dorsal margin is angularly excavated and 

 the lunule small. 



Philippine Archipelago. A. Adams. 



55. Tapes Indica (pi. cli. f. 146, 147), Hanky, MS. 



T. testa subrhomboidea, fulva, fusco maculatim radiatfi, intus 

 aurantia ; sulcis acutis, numerosis, insequalibus, radiatis, et cos- 

 tellis concentricis, ad latera elevatis, et postice costellis radiatis, 

 angulatis, serratis, decussata ; latere postico oblongo, subtruncato ; 

 margine dorsali subdeclivi, depresso, literato ; latere antico brevi, 

 declivi ; lunula magna, ovali, griseo-literata ; margine ventrali 

 paululum arcuato. 



Indian Seas. Mr. Cuming brought specimens from the Phi- 

 lippines. 



