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MARINE MOLLUSCA. 615Family PLANAXIDAE.226. Planaxis ineptus, Gould, 17, 40, a, XX, 41, /A'. X.The Maldive specimens are a little larger than the dimensions given by Gould, being 5| mm.in length. Most of them also exhibit a purplish stain on the columella which is not referred toin the original description. There are generally three principal colour lines upon the body-whorl—one above the periphery, one below it and the third still more anterior.Family LITTORINIDAE.227. Littorina glabrata, Piiilippi, 33,6, 37, X. XI, XV.228. Littorina scabra, Linn. 37, X. XV.229. Littorina undulata, Gray, 37, X. XI, XV.Family SOLARIIDAE.230. Solarium modestum, Philippi, 40, b, I. V.231. Philippia cingulum, Kiener, 4:0, b, III. II, IX.Family HIPPONYCIDAE.232. Mitrularia cicatricosa. Reeve ifialyftraea cicatricosd, Reeve, 37, XI.) IX.233. Mitrularia equestris, Liun, {Calyptraea equestris, Reeve, 37, X/.) IX.234. Hipponyx danieli, Crosse {Cajndus danieli, Crosse, 11, b). Ill—V.235. Hipponyx australis, Lamarck, 41, VIII.Family CAPULIDAE.236. Thyca crystallina, Gould {Hipponyx crystcdlinus, Tryon, 41, VIII.) VIII.Family XENOPHORIDAE.237. Xenophora indica, Gmelin, 41,1'///. (Phorus indica, Reeve, 37,/.) V.Family VANICOROIDAE.238. Vanicoro cancellata, Lamarck, 41, VIII., 40, b, V. IX, XIII.Family NATICIDAE.239. Natica robillardi, Sowerby, 40, d. XII, XV.240. Natica euzona, Recluz (PI. XXXV. fig. 22), 36 (iV. picta, partim, Reeve, 37, /A'.N. decora, Philippi, 33, a). VII.The operculum of this species is shelly, white, concave externally, shining except in the middlewhere there is a dull opaque thickening. The outer curved side has a tiiickened edge, within79—2