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''Omphalorissa purchasi'' is a species of small land snail, a terrestrial gastropod mollusc in the family Hydrocenidae. The type specimen is stored in the Imperial Natural History Museum, Vienna.〔 == Description == The shell is minute, globosely conical, translucid, imperforate (no umbilicus. The sculpture consists of very fine growth-striae only. The colour is horny-fuscous. The epidermis is thin and shiny. The spire is conical, and rather obtuse. The protoconch is minute, strongly convex, smooth. The shell has 4-5 convex whorls.〔 The last whorl is slightly greater than one-third of the height of the shell. The base is convex. The suture is impressed. The aperture is a little oblique, subcircular. The peristome is simple, straight. The columella is slightly concave, white. The inner lip is spread over the umbilicus, sealing it up more or less completely. The callus on the penultimate whorl unites the margins, and is conspicuous.〔 The width of the shell is 1 mm. The height of the shell is 2 mm.〔 The radula was described by Suter.〔Suter H. (????). T.N.Z.I., xxiv, 301, pi. 23, f. 58.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Omphalorissa purchasi」の詳細全文を読む スポンサード リンク
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