528 THE CHICAGO ACADEMY OF SCIENCES. 
32-33. Galba intertexta (CurRIER). Black Lake, Holland, Mich., adult 
(23722). 
34-35. Galba catascopium (Say). Black Lake, Holland, Mich. (23723). 
Figures 1-5, 11, 12, 32-35, slightly enlarged; figure 31, enlarged about 2 diameters; 
figures 6-10, 13-30, natural size. 
PLATE XLI- 
Figure 1. Galba catascopium (Say). Delaware River, near Burlington, N. J. 
(24632). 
2. Galba catascopium (Say). Delaware River, Philadelphia, Pa., near 
Say’s original locality (24616). 
3. Galba pinguis (SAY) =catascopium (Say). Deiaware River, Phila- 
delphia, Pa. (24616). : 
4. Galba pinguis (SAy) =catascopium (Say). Ohio (23771). 
5. Galba davisi (WALKER). Fish Point, Tuscola Co., Mich. Type (Coll. 
Walker, 20092). 
6-7. Galba pseudopinguis (BAKER). Canarsie, Long Island, N. Y. 
(24535). 
8-9. Galba decollata (MicHEts). Maine. Bos. Soc. N. H., 24192). 
10. Galba decollata (MicHEts). Maine. (Coll. Walker). 
11-14. Galba sumassi (Baird). Types in British Museum. 11-12 and 
13-14 back and front view of same specimen. 
15-17. Galba sumassi (BatrD). Echo Canyon, Utah (23879). 
18. Galba emarginata (Say). Lake Superior (23991). 
19-20. Galba emarginata (Savy). Mackinac Island, Mich. (23676). 
21-24. Galba emarginata (SAvy). Seneca Lake, N. Y. (23680). 
25. Galba emarginata mighelsi (BINNEY). Square Lake Inlet, Aroos- 
took Co., Me. (23693). 
Figures 1-17, enlarged about 1% diameters; figures 18-25, natural size. 
PEATE - xaeii, 
Figures 1-4. Galba catascopium niagarensis BAKER. Squaw Island, Niagara 
River, N. Y. (23743). 
5-8. Galba catascopium adamsi BaKer. St. Clair Flats, near Detroit, 
Mich. (TyPEs, 23730). 
9-13. Galba pseudopinguis (BAKER). Crystal Brook, Long Island, N. Y. 
N. Y. (Types, 23800). 
14-17. Galba nasoni' (BAKER). Thunder Bay Island, Alpena, Mich. 
(TYPEs, 23788). 
18-20. Galba woodrufi (BAKER). Lake Shore, Oak St., Chicago, Ills. 
(Types, 3425). 
21-22. Galba woodrufi (BAKER). Lake Shore, Chicago, Ills. (23791). 
23-25. Galba decollata (MicHets). Maine (Walker Coll., ex Mighels, 
1926). 
26. Galba decollata (MicHELS). Unity, Maine (23811). 
27-31. Galba jacksonensis (BAKER). Jackson Lake, Wyoming. (TyPEs, 
23806). 
32-33. Galba gabbii (Tryon). Clear Lake, Cal. (Coll. Hemphill). 
