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Show 1871.] MR. E. A. SMITH ON WEST-AFRICAN SHELLS, 737 80. CYCLOSTREMA TRICARINATA, sp. nov. (Plate LXXV. fig. 26.) Testa parva, depressa, alba, late perspective umbilicata; anfract. rapide augentes, spiraliter lirati; spira plana; sutura depressa anfract. ult. acute tricarinatus; carina mediana maxima ; subhexagonalis; perist. carinis triangulatum, marginibus callo tenui junctis. Alt. 1 mill., diam. maj. 3. Hab. Whydah. A prettily lirated, depressed species, with the body-whorl tricari-nate, the centre keel being the largest. 81. CYCLOSTREMA ROSEOTINCTA, sp. nov. (Plate LXXV. fig. 27.) Testa parva, pallido-rosea, valide umbilicata; anfract. 4, spiraliter leviter lirati, incrementi lineis subtiliter sutura depressa; apertura fere circularis; perist. continuum. Alt. 1| mill., diam. maj. 1|-. Hab. Whydah. This species has somewhat the appearance of a non-pearly Margarita, and it is with doubt that I refer it to Cyclostrema. 82. ETHALIA LIRATA, sp. nov. (Plate LXXV. fig. 23.) Testa parva, alba, subimperforata; anfract. 3|, spiraliter lirati, infra suturam et circa regionem umbilicalem radiatim plicati; apertura circularis; perist. continuum, crassum. Alt. 2 mill., diam. maj. 3. Hab. Whydah. A somewhat globular species, finely lirate spirally, and beneath the suture and the umbilical callosity strongly plicate. 83. ETHALIA PLICATA, sp. nov. (Plate LXXV. fig. 24.) Testa parva, alba, Icevis; anfract. 3|, rapide augentes ; incrementi lineis subtilissime striati; spira depressa; sutura callosa, sulcata; regio umbilicalis callositate plicata partim obtecta circularis; perist. solidum, marginibus callo crassissimo junctis. Alt. 1-j mill., diam. maj. 2\. Hab. Whydah. A small, nearly smooth species, with a callous sulcate suture to the whorls, and also a callosity nearly concealing the umbilicus ; in many respects agreeing with the genus Leucorhynchia of Crosse. 84. TEINOSTOMA SOLIDA, sp. nov. (Plate LXXV. fig. 25.) Testa solida, parva, pallido-fulva, Icevis ; anfract. 4, rapide ultimus superne Icevis, basi planiusculus, spiraliter trisulcatus regio umbilicalis callosa; apertura depresso-rotundata; basi recedens. Alt. 2 mill., diam. maj. 3^. Hab. Whydah. A depressed species, plain above and trisulcate beneath. |