I89T.^ MR. E. A. SMITH ON SHELLS FROM ADEN. 423 



■Romei'a figures 2c, 2d, and 2e do not, I think, represent yonng 

 specimens of S. menstrualis, but in my opinion, at all events fia;. 2 e, 

 illustrate the adult state of a distinct species, s[)ecimens of which in 

 the British Museum from the island of Formosa bear the name of 

 S. cumingii, Hauley. This species has not been described, but 

 appears in a list of Formosan shells published by Mr. Cuming in 

 the Proc. Zool. Soc. 18()5, p. 196. It is remarkable for the radiating 

 character of its markings, its radiating strice, and concentric periodic 

 bluish zones. The interior may be more or less violet, or white, or 

 flesh-tint, and the pallial sinus is something like that of S. menstru- 

 alis, but does not couverge to so sharp a point. 



188. Cytherea (Tivela) ponderosa, Koch. 

 Sab. Zanzibar ; Aden {Caramagna). 



189. Cytherea (Callista) umbonella, Lamarck. 



nab. Brazil ; Red Sea (^Lamarck). 



A single valve was all that was obtained by Major Yerbury. It 

 is in perfectly fresh coudition and of the same viulet colour as the 

 specimen figured by Reeve (Conch. Icon. Dione, fig. 27). I have 

 never seen specimens from Brszil, but according to Romer it is 

 plentiful on the coast of that country. 



190. Cytherea (Callista) Florida, Lamarck. 



Hab. Red Sea, Persian Gulf, Mozambique, Madagascar, Sey- 

 chelles ; Aden (Caramagna). 



191. Cytherea (Caryatis) hebrjEA, Lamarck. 



Hab, Philippine Islands and New South Wales. 

 For remarks upon this species see the Report upon the Lamelli- 

 branchiata of the 'Challenger' Expedition, pp. 138-9. 



192. Cytherea (Caryatis) yerburyi, nom. nov. 



Dione erubescens, Reeve {non Dunker), Conch. Icon. pi. xi. fig. .54. 



Hab. Ceylon (Reeve) ; Queensland (Mr, Brazier's Coll.) ; Japan 

 (MS. note in B.M.) 



I agree with Reeve in considering this species distinct from C. 

 crocea, Desh. (=C. deshayesii, Pfr.), the differences in shape and 

 sculpture, and colour also, being quite sufficient, in my opinion, 

 to warrant its specific separation. The name erubescens being pre- 

 occupied by Dunker for a species from West Africa, I have substi- 

 tuted that of yerburyi. 



193. Circe corrugata (Chemnitz). 



Hab. Red Sea, Persian Gulf, Madagascar, New Holland ; Aden 

 (Caramagna). 



194. Circe intermedia, Reeve. 



Hab. Not previously recorded. 



Several specimens from Aden prove the validity of this fine 



