530 THE CHICAGO ACADEMY OF SCIENCES. 



21-23. Galba emarginata ontariensis ("MuHLF." KUSTER). Rose Hill 



Cemetery, Buffalo, N. Y. (23758). 

 24-25. Galba emarginata ontariensis ("MUHLF." 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 ("MUHLF." KUSTER). Pigeon Lake, 



Ontario (23317). 

 29-30. Galba pilsbryana (WALKER). Isle Royale. Immature. COTYPES 



(23672.) 

 31. Galba pilsbryana (WALKER). Washington Harbor, Isle Royale, Mich. 



TYPE (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. 



(TOPOTYPES, 24538). 

 5-8. Galba montana (ELROD). 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, pi. 4, 

 figs. 13, a, b. 



16-17. Galba anticostiana (DALL). 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 XL VII. 



Figure 1. Galba oronensis (BAKER). Orono, Maine, COTYPE (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). 



