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Circumstella devexa
''Circumstella devexa'' is a species of sea snail, a marine gastropod mollusk in the family Liotiidae.〔Marshall, B. (2013). Circumstella devexa (Hedley, 1901). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=719263 on 2013-08-2〕
==Description==
(Original description by Charles Hedley) The height of the shell attains 3.3 mm. The very solid, widely umbilicate shell has a turbinate shape with the whorls in transverse section nearly square. The colour of the dull shell is creamy white. It contains four whorls. The upper two whorls are unsculptured, the last descending steeply and suddenly. The whole surface is densely covered by fine, close, radiating threads. The periphery is flattened, with a keel at the upper and lower angles, the superior crenulated. Outside the deeply impressed suture runs a row of denticules. The base of the shell is flattened. The abrupt margin of the aperture is scalloped. The very oblique aperture is semilunate with two massive lips, one within the other.〔(Hedley, C. 1901. ''Studies on Australian Mollusca. Part IV.'' Proceedings of the Linnean Society of New South Wales 26: 16-25 (8, pl. 2, figs 4-6) )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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