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Dillwynella houzeaui
''Dillwynella houzeaui'' is an extinct species of sea snail, a marine gastropod mollusk in the family Skeneidae.〔( Cossmann (1913), Révision des scaphopodes, gastropodes et céphalopodes du montien de Belgique; Mémoires du Musée Royal d'Histroire Naturelle de Belgique 1913 ), p. 36〕
==Description==
The height of the shell attains 2.5 mm, its diameter 4 mm. The rather small, nacreous shell is wider than high. The surface appears perfectly smooth and glazed with traces of brown wavy lines. The depressed spire has a conoidal shape. It consists of four barely convex whorls, increasing
rapidly in size under an apical angle of 160 ° on average. They are separated by linear, clearly visible sutures. The body whorl forms almost the entire shell. It is round at the periphery which is not angular, even if both faces of the shell are rather depressed. The base of the shell is moderately convex, topped in the center with a more whitish coating that thickens toward the aperture to form a flattened and callous auricle at the end of the columellar edge and above a relatively narrow umbilical opening. The aperture is round. The peristome is discontinuous. The outer lip is oblique. The excavated columella is smooth.〔
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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