424 MR. E. A. SMITH ON SHKLLS FROM ADEN. [Jlinel6, 



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

 somewhat in torin, 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 (Liuconcha) callipyga (Born). 

 Hab. Red Sea ; Aden {Caramagna). 



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 having the hinge-teeth white 

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

 with the usual type of the species. 



199. Tapes sulcarius, Lamarck. 

 Kab. Moluccas, Indian Ocean. 



200. Tapes deshayesii, Hanley. 



Hab. Philippine Islands; Mauritius; Red Sea {Tssel and Brit. 

 Mus.). 



The single specimen from x\den is marked very similarly to that 

 figured by Reeve (Con. Icon. f. A a). 



201. Tapes malabaricus (Chemnitz). 



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



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

 yinosa (Con. Icon. f. 2b), which I consider a form of this species. 

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

 sinuated posterior margin. The tinest specimen is 12 milhm. long, 

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

 turgidula (Con. Icon. f. 32) a " var. nioustrosa " 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 a-3 6. T. infiata, as determined by Romer, 

 appears to be a large coarsely ribbed T. malabaricus. T. iriflalus 

 proper is perfectly smooth at the um bones and has less sinuation 

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

 T. malabaricus. 



202. Tapes obscuratus, Deshayes, var. 



Hab. Philippine;;. 



Three speciinens from Aden may belong to this species. They 



' Moiiogr Tupc^, \). ;J4. 



