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A Review of the North American Freshwater Snail Genus Pyrgulopsis

A Review of the North American Freshwater Snail Genus Pyrgulopsis

A Review of the North American Freshwater Snail Genus Pyrgulopsis

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100<br />

SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />

FIGURE 43.—Penes <strong>of</strong> western <strong>Pyrgulopsis</strong>: a. P. aardahli, USNM 857951; b, P. amargosae, USNM 857972; c,<br />

P. archimedis, USNM 874342; d, P. arizonae, USNM 847226; e, P. avernalis, USNM 874000;/. P. bacchus,<br />

USNM 847203. (Bar = 0.5 mm.)

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