FAMILY LYMN^EID^E 69 



Limnea emarginata Haldeman, Mon. Limn., p. 10, pi. II, figs. 4-5, 1841. 



? Limnea serrata Haldeman, Mon. Limn., p. 12, pi. n, fig. 7, 1841 (path- 

 ologic specimen, figure copied by Binney, op. cit., p. 52, fig. 78). 



Limncea scalaris Westerlund, Vega Exp. Vet. Iakt., iv, p. 201, pi. iv, fig. 

 13, 1885. Not Z. scalaris A. Braun, 1853, or Sowerby, 1872. 



Ltmnaa canadensis Sowerby, Conch. Icon., xvin, Mon. Limncea, pi. vn, figs. 

 45, a~b, 1872. 



Range. — Northern United States east of the Mississippi, Canada, 

 and northwestward. 



Lakes in northern Maine (Say) ! Lake Champlain and Ontario; 

 Crooked Lake, Emmet Co., Michigan! English River, Keewatin, 

 Hudson Bay! Port Clarence, Alaska (Vega Expd.). 



After considerable study I have been forced to the 

 conclusion that several species were identified under 

 this name by Say himself, as well as others. Say's 

 figure is wretched and does not represent the typical 

 form from Maine, as at first described. The latter is 

 apparently represented by specimens labelled by Say 

 himself, still preserved in the Academy at Philadel- 

 phia, and which must be regarded as typical. The. Fig. 46. Zy;«- 

 shell is small, with an acute spire ; one of the specimens n " a emar &' nata 

 has the suture deeply impressed, but not the others, 

 which seem more normal. Westerlund's figure fairly represents the 

 species; Sowerby's Z. canadensis, judging from specimens com- 

 pared with the types by Mr. E. A. Smith of the British Museum, is 

 probably the same, though the shells are heavier and larger, with the 

 lip thickened internally, and a marked umbilicus. I should not, in 

 default of this comparison and if obliged to depend on Sowerby's 

 figures, have felt justified in uniting them. 



Lymnaea (Radix) binneyi Tryon. 



Limncea binneyi Tryon, Am. Journ. Conch., 1, p. 229, pi. xxm, fig. 3, 1865 



(Hellgate River, Oregon). 

 Limncea ampla Tryon, Mon. Freshw. Univ. Moll., part 11, p. 91, 1872, ex 



parte, not of Mighels. 



Range. — Northern United States west of Lake Huron and the 

 adjacent British possessions. 



Lake Higgins, southern Michigan ! Lake Houghton, northern Mich- 

 igan ! east of Fort Colville, Wash. ! Fort Vancouver, Columbia River ! 

 Sumas Prairie, B. C. ! Vancouver Island; Clear Lake, Athabaska, 

 N. Lat. 56 ! Lake Isle Lacrosse, Athabaska ! English River, Manitoba ! 



This species appears to be quite recognizable but has been frequently 

 distributed under the name of Z. sumassi or ampla, with the latter of 



