530 
THE CHICAGO ACADEMY OF SCIENCES. 
21-23. Galba emarginata ontariensis (“Muutr.” Kuster). Rose Hill 
Cemetery, Buffalo, N. Y. (23758). 
24-25. Galba emarginata ontariensis (“Muutr.” Kuster). Fort Erie 
Grove, near Buffalo, N. Y. (23688). 
26-27. Galba emarginata ontariensis (“MuHLF.” Kuster). Stoney Island, 
Saginaw Bay, Mich. (24505). 
28. Galba emarginata ontariensis (“Muutr.” Kuster). Pigeon Lake, 
Ontario (23317). 
29-30. Galba pilsbryana (WALKER). Isle Royale. Immature. CoTyPEs 
(23672. ) ‘ 
31. Galba pilsbryana (WALKER). Washington Harbor, Isle Royale, Mich. 
Tyre (Coll. Walker, 21345). 
Figures 1, 16-28, a trifle enlarged; other figures natural size. 
PLATE XLVI. 
Figures 1-4. Galba contracta (Currier). Higgins Lake, Roscommon Co., Mich. 
(TopotyPeEs, 24538). 
5-8. Galba montana (Etrop). Mission Mts., Montana. (TopotyPes, 
23709). 
9-11. Galba binneyi (Tryon). Lake Louise, Alberta. (Coll. Phil. Acad. 
Sci., 91207). 
12. Galba binneyi (Tryon). Sawtooth Lake, Idaho. (Coll. Smith. Inst.). 
13. Galba randolphi (Baker). Marsh Lake, Dyea Valley, Yukon Terri- 
tory. (Type, 23089). 
14-15. Galba alaskensis BAKER =scalaris West. Vega Exp., IV, pl. 4, 
figs. 13,-a5 te 
16-17. Galba anticostiana (DatL). Marl Lake, Anticosti Island. (Co- 
TYPES, 23875). 
18-24. Galba nashotahensis (BAKER). Marl beds, Nashotah, Wisconsin. 
(Types, 24539). 
Figures 1-4, 9-24, slightly enlarged; figures 5-8, natural size. 
PLATE ALYIT. 
Figure 1. Galba oronensis (BAKER). Orono, Maine. CotypEe (23784). 
2-3. Galba oronensis (BAKER). Orono, Maine. Types (Coll. Walker, 
7912). 
4-8. Galba oronensis (BAKER). Aroostook River, Caribou, Maine 
(23786). 
9. Galba oronensis (BAKER). Ottawa, Canada. ( Coll. Walker, 2540). 
10. Galba catascopium (Say). Calumet River, Chicago (23875). 
11-12, 14-18. Galba binneyi (Tryon). Lake Superior (23716). 
13. Galba binneyi (Tryon). Lake Superior (23715). 
19-22. Galba apicina (Lea). Lake Superior (23718). 
23-24. Galba apicina (LEA). Union River, Mich. (23719). 
25. Galba apicina (LEA). Brule River, Iron Co., Mich. (Coll. Walker, 
22924). 
26-27. Galba apicina (Lea). Twin Falls, Iron Co., Mich. (Coll. Walker, 
22934). 
