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. Ill. 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 reflera (Say). 
Photograph by F. M. Woodruff (Bull. Ill. State Lab. N. H., pl. XVII, fig. 1). 
PEATE Tepe: 
Figure 1. Small pond near Glencoe, Illinois. Habitat for Galba reflexa 
(Say.) This pond is filled with cat-tails (7ypha latifolia). Photograph by 
F. M. Woodruff (Bull. Ill. State Lab. N. H., pl. XII, fig. 1). 
Figure 2. Small embayment in Tomahawk Lake, Wisconsin. Habitat for 
Galba lanceata (GouLp) and Galba emarginata wisconsiensis (BAKER). Photo- 
graph by F. C. Baker. 
PLATE LII. 
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. 
PEATE Liv: 
Figure 1. East fork of the North Branch of the Chicago River, near Glen- 
coe, Illinois. Habitat for Galba parva sterkti (BAKER). Photograph by F. M. 
Woodruff (Bull. Ill. State Lab. N. H., pl. 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 
Lymnea stagnalis appressa Say. Photograph by F. C. Baker. 
Figure 2. Quynoch Point, Tomahawk Lake, Wis. Galba lanceata (GouLp) 
inhabits the marshy area near the shore, while Lymnea stagnalis lilliane 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 woodrufi (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. 
