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Euphysetta nathorstii Cleve, 1899

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Euphysetta nathorstii:
Shell ovate, with a single spine on the apical pole. Structure double: coarser longitudinal (9 in 0.01mm) and transverse (8 to 9 in 0.01mm) faint ribs crossing each other at right angle and, besides, very small puncta arranged in obliquely decussating rows (17 in 0.01 mm). Peristome short and wide, with four slender articulate teeth, three of the same length but the fourth much longer. From the middle of the fourth tooth there issues in the middle a small spine.
Cleve 1899











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