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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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108<br />

SMITHSONIAN CONTRIBUTIONS TO ZOOLOGY<br />

FIGURE 51.—Penes <strong>of</strong> western <strong>Pyrgulopsis</strong>: a. P. sola, USNM 850290 (bar = 0.25 mm); b, P. stearnsiana, USNM<br />

874181 (bar = 1.0 mm); c, P. <strong>the</strong>rmalis, USNM 873250 (bar = 0.5 mm); d, P. thompsoni, USNM 847238; e, P.<br />

trivialis, USNM 847234;/. P. wongi, USNM 857941. (Scale for d-fas for b.)

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