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A Review of the North American Freshwater Snail Genus Pyrgulopsis

A Review of the North American Freshwater Snail Genus Pyrgulopsis

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NUMBER 554 45<br />

FIGURE 18.—Western <strong>Pyrgulopsis</strong>: a-c. P. kolobensis, USNM 847249 (a. shell. 3.2 mm; b,c. opercula, bar =<br />

0.43 mm); d-g, P. longinqua (d. shell (left), USNM 526733, 3.5 mm; e. shell (right), USNM 874059, 2.3 mm;<br />

f,g, opercula, bar = 0.3 mm).

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