532 THE CHICAGO ACADEMY OF SCIENCES. 



PLATE LI. 



Figure 1. Open area in woods near Glencoe, Illinois. Habitat for Galba 

 caperata (SAY), in the summer, when the woods are filled with small pools. 

 Photograph by F. M. Woodruff (Bull. 111. State Lab. N. H., plate XIV). 



Figure 2. Summer-dry pond near Glencoe, Illinois. In the spring this pond 

 contains water one to three feet in depth. Habitat for Galba reflexa (SAY). 

 Photograph by F. M. Woodruff (Bull. 111. State Lab. N. H, pi. XVII, fig. 1). 



PLATE LII. 



Figure 1. Small pond near Glencoe, Illinois. Habitat for Galba reftexa 

 (SAY.) This pond is filled with cat-tails {Typha latifolia). Photograph by 

 F. M. Woodruff (Bull. 111. State Lab. N. H., pi. XII, fig. 1). 



Figure 2. Small embayment in Tomahawk Lake, Wisconsin. Habitat for 

 Galba lanceata (GOULD) and Galba emarginata wisconsiensis (BAKER). Photo- 

 graph by F. C. Baker. 



PLATE LIII. 



Figure 1. Marshy pond near Sander's Resort, Tomahawk Lake, Wisconsin. 

 This pond was artificially made by damming a small brook emptying into the 

 lake. Habitat for Galba lanceata (GOULD). Photograph by F. C. Baker. 



Figure 2. Thoroughfare between Tomahawk Lake and Little Tomahawk 

 Lake, Wisconsin. Habitat for Bulimnea megasoma (SAY) and Pseudosuccinea 

 columella (SAY). Photograph by F. C. Baker. 



PLATE LIV. 



Figure 1. East fork of the North Branch of the Chicago River, near Glen- 

 coe, Illinois. Habitat for Galba parva sterkii (BAKER). Photograph by F. M. 

 Woodruff (Bull. 111. State Lab. N. H, pi. XVII, fig. 2). 



Figure 2. Shore of Canandaigua Lake, near Canandaigua, N. Y. Habitat 

 for Galba modicella rustica (LEA). Photograph by F. C. Baker. 



PLATE LV. 



Figure 1. St. Lawrence River, near Thousand Island Park. Habitat for 

 Lymn&a stagnalis appressa SAY. Photograph by F. C. Baker. 



Figure 2. Quynoch Point, Tomahawk Lake, Wis. Galba lanceata (GOULD) 

 inhabits the marshy area near the shore, while Lymncsa stagnalis lilliana BAKER 

 occupies the sandy beach on the more exposed shore, in company with Galba 

 emarginata wisconsinensis (BAKER). Photograph by F. C. Baker. 



PLATE LVI. 



Figure 1. Southern shore of Lake Michigan east of Millers, Indiana. The 

 shore is bordered by large sand dunes. Habitat for Galba woodrufii (BAKER). 

 Photograph by F. M. Woodruff. 



Figure 2. Swamp east of Wide Waters, Erie Canal, Rochester, N. Y. Hab- 

 itat for Galba catascopium (SAY). Photograph by F. C. Baker. 



