526 THE CHICAGO ACADEMY OF SCIENCES. 
PLATE XXXVI. 
Figures 1-6. Galba reflexa (Say). Rock Run, Joliet, Ills. (23546). Pathologic 
forms. 
7-11. Galba crystalensis (BAKER). Crystal Lake, Ills. (Types, 23634) 
=reflexa, immature, 
12. Galba reflexa walkeri (BAKER). Calumet River, Ills. (23572). 
13. Galba reflexa walkeri (BAKER). Calumet Lake, Ills. (23570). 
14. Galba reflexa walkeri (BAKER). Joliet, Ills. (23569). 
15-16. Galba reflexa walkeri (BAKER). Wolf Lake, Ills. (23571). 
17. Galba reflexa walkeri (BAKER). Silver Lake, Ills. (23527). 
18. Galba reflexa walkeri (BAKER). Silver Lake, Ills. (23578). A form 
with spire resembling that of e-ilis. 
19-20. Galba reflexa hemphilliana (BAKER). Lake Albert Lea, Minn. 
Types (Coll. Bryant Walker, 14037). 
21-22. Galba exilis (LEA). Calumet River, Ills. (23577). 
Figures 11 and 13 are enlarged 1% diameters; the other figures are about 
natural size. 
PLATE XXXVII. 
Figure 1. Galba exilis (LEA). Berry Lake, Chicago, Ills. (23583). 
2. Galba exilis (LEA). Antrim Co., Mich. (23591). 
3. Galba-exilis (LEA). Winnebago Co., Ills. (23580). 
4-6. Galba-exilis (LEA). Mercer Co., Ills. (23582). 
7-10. Galba extlis (LEA). Des Moines, Ia. (23585). 
11. Galba exilis (LEA). Des Moines, Ja. (23595). 
12-13. Galba kirtlandiana (LEA). Crystal Lake, Iils. (23607). 
14-16. Galba kirtlandiana (Lea). Mud Lake, Grand Crossing, Chicago, 
Ills. (23610). 
17-18. Galba lanceata (Goutp). Carp Lake, Emmet Co., Mich. (23592). 
19-22. Galba lanceata (GouLtD). Tomahawk Lake, Wis. (23590). 
23-24. Galba attenuata (Say). Near City of Mexico (Coll. Walker). 
Figure 4, enlarged about 1% diameters; figures 1-3, 11-24, slightly enlarged; 
figures 5-10, natural size. 
PLATE XXXVIII. 
Figures 1-2, Galba danielsi (BAKER). Lake Maxinkuckee, Ind. (TyPEs, 
23622). 
3. Galba danielsi (BAKER). Lake Maxinkuckee, Ind. Pathologic speci- 
men. (Coll. Bartsch). 
4-8. Galba danielsi (BAKER). Lake Maxinkuckee, Ind. (23624). 
9-11. Galba proxima (LEA). San Francisco, Cal. (23642). 
12. Galba proxima (LEA). San Mateo, Cal. (23641). 
13. Galba californica (SowERBy) = proxima (LEA). Specimen com- 
pared with Sowerby’s type in British Museum (Walker coll.). 
14. Galba proxima rowellii (Tryon). San Francisco, Cal. (Coll. Hemp- 
hill). 
15-18. Galba proxima rowellii (Tryon). San Francisco, Cal. (23659). 
Showing variation toward proxima. 
