424 MR. E. A. SMITH ON SHKLLS FROM ADEN. [June 16, 



species. It is fairly constant in colour and markings, but varies 

 somewhat in foraij some specimens being rather narrower and more 

 produced posteriorly than others. As is usual, young shells are 

 more compressed than adult specimens. 



195. Circe scripta (Linn,). 



Hab. Red Sea, Indian Ocean, Moluccas, &c. 



196. Circe (Crista) pectinata (Linn.). 



Hab. Same as preceding species. Aden (Caramagna). 



197. Circe (Lioconcha) callipyga (Born). 

 Hab. Red Sea ; Aden (Car ajnagna). 



All kinds of colouring exist among the specimens from Aden. 



198. Venus reticulata, Linn. 



Hab. Red Sea, Persian Gulf, Indian Ocean, Philippines, New 

 Caledonia, Society and Fiji Islands. 



The Aden specimens are peculiar in hiiving the hinge-teeth white 

 instead of red as usual. In other respects they correspond exactly 

 with the usual type of the species. 



199. Tapes sulcarius, Lamarck. 

 Hab. Moluccas, Indian Ocean. 



200. Tapes deshayesii, Hanley. 



Hub. Philippine Islands; Mauritius; Red Sea (Issel and Brit. 

 Mus.). 



The single specimen from Aden is marked very similarly to that 

 figured by Reeve (Con. Icon, f 4 a). 



201. Tapes malabaricus (Chemnitz). 



Hab. Malabar, Ceylon, Mergui, Moluccas, Philippines, China. 



The specimens from Aden agree precisely with Reeve's T. lenti- 

 ffinosa (Con. Icon. f. 2.5), which I consider a form of this species. 

 Thev are large strong stiells with coarse concentric ridges and a well- 

 sinuated posterior margin. The finest specimen is 7^ miUim. long, 

 57 high, and 29 in diameter. Romer^ has considered Reeve's T. 

 turgidula (Con. Icon. f. 32) a " var. monstrosa " of T. malabaricus ; 

 but I may point out that the shell figured by Reeve is a specimen of 

 T. inflata of Deshayes, which is figured in the Proc. Zool. Soc. 

 1853, pi. 19. ff. 3 «-3 6. T. injluta, as determined by Homer, 

 appears to be a large coarsely ribbed T. malabaricus. T. infiatus, 

 proper is perfectly smooth at the umbones and has less shiuatiDu 

 in the posterior ventral margin ; in otlier respects it agrees with 

 T. malabaricus. 



202. Tapes obscuratus, Deshayes, var. 

 Hab. Philippines. 



Three specimens from Aden may belong to this species. They 



' Monogr Twpcs, ^j. .!34. 



