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Show 418 MR. E. A. SMITH ON SHELLS FROM ADEN. [June 16, 151. CREPIDULA (ERG^EA) WALSHI, Hermannsen. Hab. Ceylon and Singapore (Reeve); Assab (Caramagna). 152. CALYPTR^EA (GALERUS), sp. inc. A single specimen is all I have seen of this apparently new species. It is much elevated, cap-shaped, dirty whitish externally and tinted with purple inside, especially towards the apex. It is radiately ridged and concentrically striated with wavy lines of growth. The internal process is small, slender, compressed, and placed on the side towards which the apex inclines. 153. AMALTHEA ACUTA (Quoy & Gaimard). Hab. Indian and Pacific Oceans. 154. STROMBUS TRICORNIS, Lamarck. Hab. Red Sea, Bourbon, Seychelles, Philippines. 155. STROMBUS GIBBERULUS, Linn. Hab. Aden (Caramagna) ; Red Sea, Assab, Indian Ocean, Philippines, Polynesia. 156. STROMBUS LUHUANUS, Linn. Hab. Red Sea, Assab, &c. as for S. gibberulus. 157. STROMBUS FLORIDUS, Lamarck. Hab. Same as preceding species. 158. STROMBUS DENTATUS, Lini ., var. Hab. Red Sea, Indian Ocean, &<•. The specimen from Aden belongs to the variety named /?. cleguns by Sowerby. S. ruppellii, Reeve, is another variety. 159. STROMBUS YERBURYI. (Plate XXXIII. fig. 5.) Testa parva, subfusiformis, alba, plus minus lutescenti balteata; spira gracilis, product a, longit. totius % suba?quans ; anfractus normales circiter 9, superne concavi et marginati, supra medium rotunde angulati, infra angulum fere recti, longi-tudinaliter plicati, transversimque sulcati; plica vel costce numerosee (in anfr. penult, ad 24, in ultimo 16-17, inferne sensim evanescentibus paucis labrum versus, cceteris majoribus et magis distantibus, superneque subnodosis), paucce supra spiram variciformes; sulci regulares, supra et inter castas continui, interstitia vix cequantes ; anfr. ultimus brevis, basim versus paulo constrictus; labrum dilatatum, ad marginem anfractus superiorem productum, intus et extus incrassatum, sulcatum, ad marginem acutum; apertura angusta, alba; columella callo crenulato tenui rvfo notato induta. Longit. 35 millim., diam. maj. 19. This species recalls to mind <S. cancellatus of Pease, a Sandwich- Island form. It differs in colour, in the greater length of the sj ire, its |