IIO LAND AND FRESH WATER MOLLUSKS 



by me in the paper cited in the synonymy, since publishing which I 

 find Dr. J. G. Cooper had also expressed the same opinion in 1875. 



Ancylus (Ferrissia) rivularis Say. 



Ancylus rividaris SAY, Journ. Acad. Nat. Sci., i, p. 124, 1817. HALDEMAN, 

 Mon. Limn., p. 4, pi. i, fig. i, 1844 (Delaware River). 



Ancyclus rivularis SAY, Nicholson's Encyclopedia, 3d ed. , Art. Conchology, 

 vol. ii, p. 14, 1819. 



Ancylus (Ferrissia) rivularis BRYANT WALKER, The Nautilus, xvii, No. 2, p. 

 15, June, 1903 ; xvin, No. 2, p. 17, pi. i, figs, i-io, 13-15, June, 1904. 



Range. Northern United States east of the Mississippi, New 

 Mexico, Canada, Manitoba. 



Souris River, Manitoba, Dawson. 



Ancylus (Ferrissia) parallelus Haldeman. 



Ancylus parallelus HALDEMAN, Mon. Limn., pt. 2, p. 3 of cover, 1841 (Ver- 

 mont) ; pt. 7, p. ii, pi. i, fig. 6, 1844. BINNEY, Land and Fw. Sh. 

 N. Am., ii, p. 142, 1865. 



Range. New England; Canada, Manitoba. 



Pine Creek; Rainy River; and Lake of the Woods, in Manitoba. 



Ancylus (Laevapex) fragilis Tryon. 



Ancylus fragilis TRYON, Proc. Acad. Nat. Sci. Phila., for 1863, p. 149, pi. i, 

 fig. 15. BINNEY, Land and Fw. Sh. N. Am., n, p. 146, fig. 246 (Cali- 

 fornia), 1865. TRYON, Mon. Fw. Univ. Moll. U. S., p. 229, pi. 2, figs. 17, 

 18, 1872. 



? Ancylus caurinus COOPER, Rep. N. Hist. Wash., p. 378, 1859 ; Pacific R. R. 

 Reps., xii, p. 378, 1859, nude name. BINNEY, Land and Fw. Sh. N. 

 Am., n, p. 144, fig. 243, 1865 ; Proc. Cal. Acad. Sci., iv, p. 100, 1870. 

 Black River, Puget Sound. 



Range. California ; Puget Sound drainage 

 (caurinus}, Vancouver Island near Victoria ! 

 (caurinus}. 



Tryon unites these under his prior name. 



The Vancouver specimens are certainly iden- 



FIG. 82. Ancylus koo- J 



taniensis Baird. tical with Cooper's shell . 



Ancylus (Laevapex) kootaniensis Baird. 



Ancylus kootaniensis BAIRD, Proc. Zool. Soc. London, for 1863, p. 69. 

 BINNEY, Land and Fw. Sh. N. Am., n, p. 144, fig. 242, 1865. TRYON, 

 Mon. Fw. Univ. Moll. U. S., p. 227, pi. n, figs. 11-12, 1872. 



Range. Kootenai and Spokane Rivers, British Columbia. 



