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Show 1891] MR. E. A. SMITH ON SHELLS FROM ADEN. 423 Romer's figures 2c, 2d, and 2e do not, I think, represent specimens of S. menstrualis, but in my opinion, at all events fi°;. 2 e, illustrate the adult state of a distinct species, specimens of which in the British Museum from the island of Formosa bear the name of S. cumingii, Hanley. This species has not been described, but appears in a list of Formosan shells published by Mr. Cuming in the Proc. Zool. Soc. 1865, 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. menstrualis, but does not converge to so sharp a point. 188. CYTHEREA (TIVELA) PONDEROSA, Koch. Hab. Zanzibar; Aden (Caramagna). 189. CYTHEREA (CALLISTA) UMBONELLA, Lamarck. Hab. Brazil ; Red Sea (Lamarck). A single valve was all that was obtained by Major Yerbury. It is in perfectly fresh condition and of the same violet colour as tbe specimen figured by Reeve (Conch. Icon. Dione, fig. 27). I have never seen specimens from Brazil, 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, Seychelles ; Aden (Caramagna). 191. CYTHEREA (CARYATIS) HEBR^EA, 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 (won 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 preoccupied by Dunker for a species from West Africa, I have substituted that of yerburyi. 193. CIRCE CORRUGATA (Chemnitz). Hab. Red Sea, Persian Gulf, Madagascar, New Holland ; Aden (Caramayna). 194. CIRCE INTERMEDIA, Reeve. Hab. Not previously recorded. Several specimens from Aden prove the validity of this fine |