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Trochus firmus : ウィキペディア英語版 | Trochus firmus
''Trochus firmus'' is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.〔Bouchet, P. (2014). Trochus firmus Philippi, 1849. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=723681 on 2014-06-15〕 ==Description== The size of the adult shell varies between 20 mm and 26 mm. The notably thick, solid shell has a rather conical shape. It is, transversely sulcate. It has a pale green ground, painted with close purple-red streaks above. The base has red-spotted girdles.The whorls are a little subangular above the suture and a little plicate below the sutures, appearing somewhat terraced. The body whorl is rounded-angulate and passes into the base with a blunt angle. The sculpture consists of about 7 weak smooth transverse grooves on the upper surface, and about 4 scarcely elevated concentric girdles on the base. The base of the shell is nearly plane, obsoletely cingulate and false-umbilicate. The funnel-shaped pit occupying the place of the umbilicus has a slightly elevated liration.The aperture is rhomboidal. The entirely simple columella is very oblique. 〔 (H. Pilsbry, Manual of Conchology XI, Academy of Natural Sciences, Philadelphia ) (described as ''Trochus (Infundibulops) firmus'')〕
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