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Crossea inverta
''Crossea inverta'' is a species of small sea snail or micromollusc, a marine gastropod mollusc in the family Crosseolidae.〔Bouchet, P. (2012). ''Crossea inverta'' Hedley, 1907. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=596657 on 2012-09-01〕
==Description==
(Original description by Charles Hedley) The height of the shell measures 2.45 mm, its diameter 2.65 mm. The very solid, milk-white shell has a biconical shape. The base of the shell is produced, much exceeding the spire, which is low and gradate. The shell contains four whorls, the first minute, unsculptured, the others rapidly
increasing in size, parted by channelled sutures.
Sculpture : the upper whorls carry three thick, elevated, spiral ribs, divided by broad, deep grooves. These vanish on the body whorl, which is entirely covered by dense, microscopic spirals so crossed by radials as to give the eflfect of fine punctures over the whole surface. The basal funicle is massive, coiled on the body whorl like a subsidiary whorl, far extended anteriorly, its truncate extremity excavate. A small perforation occurs below the subcircular aperture in the base of the funicle. The simple outer lip simple is inner reflected over the umbilicus. The umbilicus has superiorly a narrow spiral perforation, inferiorly a trough hollowed between the columella and the funicle.〔( Charles Hedley, The Mollusca of Mast Head Reef, Capricorn Group, Queensland. Part II; Proceedings of the Linnean Society of New South Wales v. 32 (1907) )〕
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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