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Gibbula magus
''Gibbula magus'', common name the great top shell, is a species of small sea snail, a marine gastropod mollusc in the family Trochidae, the top snails.〔Gofas, S. (2013). Gibbula magus (Linnaeus, 1758). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=141790 on 2014-01-28〕
==Description==
The size of the shell varies between 17 mm and 35 mm. This is an abundant species. The solid, widely, deeply umbilicate shell has a low-conical shape. There is great variation in color. It is whitish or yellowish, painted with zigzag radiating stripes, maculations or lines of pink or rich brown, sometimes so broken into minute flecks as to appear minutely mottled all over, or sometimes lacking markings. The base of the shell is radiately zigzag-striped. The apex is acute. The conical spire contains 7 to 8 whorl. These are swollen, gibbous and radiately plicate beneath the sutures, and with a rim or flange at the periphery. The entire surface is spirally finely striate. The base is convex. The aperture is very oblique, rounded-rhomboid, and smooth within. The columella oblique, its edge straight or slightly convex in the middle, at its insertion reflexed slightly over the umbilicus. The umbilicus is bounded by a strong spiral rib. 〔 (Tryon (1889), Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) 〕
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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