. The Canadian field-naturalist. Natural history. Figure 2. Microphysula cookei, RBCM 000-062-001, locality 9. (1948)] from St. Paul Island, Bering Sea, Alaska. In northern British Columbia, this species has recently been found in the Queen Charlotte Islands (Forsyth, unpublished). I have also collected it from Hyder, southeast Alaska. The remaining Vertigo material is less easily iden- tified. The nomenclature of Nearctic Vertigo (see Pilsbry 1948) requires a complete reassessment. However, most specimens resemble Vertigo modesta parietalis (Ancey, 1887) more than anything else in the V. mode
. The Canadian field-naturalist. Natural history. Figure 2. Microphysula cookei, RBCM 000-062-001, locality 9. (1948)] from St. Paul Island, Bering Sea, Alaska. In northern British Columbia, this species has recently been found in the Queen Charlotte Islands (Forsyth, unpublished). I have also collected it from Hyder, southeast Alaska. The remaining Vertigo material is less easily iden- tified. The nomenclature of Nearctic Vertigo (see Pilsbry 1948) requires a complete reassessment. However, most specimens resemble Vertigo modesta parietalis (Ancey, 1887) more than anything else in the V. modesta group. There is also less frequently an elongate, somewhat prominently rib-striate form. Figure 3. Pristiloma spp. from the Babine Range, Skeena Mountains. A, P. arcticum, RBCM 000-064-002, locality 10. B, P. chersinella, RBCM 000-063-001, locality 6. that appears to intergrade with the more common, stouter and smoother form. Vespericola columbianus (I. Lea, 1838), Northwest Hesperian This is a common snail along the entire coast of British Columbia, extending inland along major river valleys. An empty shell and a fragment were found at sites 4 and 5, respectively, on Hudson Bay Mountain. The discovery of this species on Hudson Bay Mountain was unexpected, since it was not found in the nearby Bulkley Valley. The nearest known valley population of V. columbianus is near the confluence of the Suskwa and Bulkley Rivers (55°'N, 127°'W; elevation ca. 300 m), ca. 43 km northwest of Hudson Bay Mountain. South- west from the mouth of the Suskwa River this species is common along the Bulkley and Skeena Rivers to the coast (personal observation). Within the genus Vespericola, reproductive anat- omies are more useful in determining species than conchological characters (Roth and Miller 1993). Roth and Miller mentioned dissected British Columbia material, and they established that V. columbianus (but not "Vespericola columbianus pil- osus", which is a separate spe
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