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Mikadotrochus beyrichii
''Mikadotrochus beyrichii'', common name Beyrich's slit shell, is a species of sea snail, a marine gastropod mollusk in the family Pleurotomariidae.
It was discovered by Dr. Hilgendorf in an ancient Japanese collection.
==Description==
The size of the shell varies between 50 mm and 100 mm. The shell has a trochiform shape. It is as high as broad. It has a flat base. It shows moderately numerous spiral lines. It is pale yellow, beautifully flamed with 11 red whorls that are regularly increasing. The penultimate whorl has 8 lirae above, 2 in and 2 under the slit fasciole. These lirae are beset with weak nodules, about 3 times as long (in the direction of the spiral) as high or broad. The body whorl has a blunt angle at its base. This base contains 20 concentric lirae, and in the middle a deep pit or "false umbilicus". On the outside it is white, on the inside it is pearly. The thick, pearly columellar margin is S-shaped. 〔 (G.W. Tryon (1890), Manual of Conchology vol. XII, p. 71 ) (described as ''Pleurotomaria beyrichii'') 〕
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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