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Dillwynella aulacophora
''Dillwynella aulacophora'' 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 4 mm, its diameter 5 mm. The rather small shell had a trochoid shape. The surface appears smooth and shiny. The depressed spire consists of four or five subangular whorls, equipped with a broad groove between the spiral obsolete angle and slightly protruding bead that comes in above the linear and deep suture. In the middle of this groove, there is a small furrow that marks its deepest point. Above the angle , the profile of the whorls is a slightly convex. The body whorl is equal to five-sixths of the total height simply striated. It is marked by oblique growth lines. The periphery is obtusely subangular, non keeled , but rather rounded. The base of the shell is slightly convex and smooth. The aperture is round. The peristome is discontinuous and thin, except in the columellar region that contains a callosity.〔
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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