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Clanculus johnstoni
''Clanculus johnstoni'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Rosenberg, G. (2012). ''Clanculus johnstoni'' Hedley, 1917. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=594197 on 2012-11-23〕
==Description==
The height of the shell attains 6 mm, its major diameter also 6 mm. The small, solid shell has a globose-conic shape. It has a carmine colour with radial buff dashes, about eight to a whorl, reaching from the suture half-way to the periphery. The umbilicus and the bordering funicle is white. As in allied forms, there is a colour dimorphism i nwhich olive brown replaces the carmine, a trace of which remains on the summit. The shell contains five whorls. On the penultimate whorl there are four spirals, the upper being a double bead row, and a fifth half-buried in the suture by the succeeding whorl. On the body whorl there are thirteen spirals which become taller, broader, more widely spaced and more inclined to break up into beads as they ascend from base to suture. The oblique aperture is finally ascending. Within the outer lip are about a dozen entering ridges, the lowest larger than the rest. The oblique columella is twisted, the edge reflected, with a large tooth at the base and a small one above. The umbilical margin broadly overreaches the cavity, its edge with three or four denticules. A translucent callus unites the lips.〔(Hedley, C. 1917. ''Description of a new shell from Caloundra''. Proceedings of the Royal Society of Queensland 29: 55-56 )〕
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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