LYMN^IME OF NORTH AMERICA. 529 



34. Galba gabbii (Tryon). Clear Lake, Cal. (23810). From type lot, 



ex. Tryon. 



35. Galba gabbii (Tryon). San Francisco, Cal. (Coll. Hemphill). 



36. Galba gabbii (Tryon). San Francisco, Cal. (23332). 



Figures 1-13, 18-25, slightly enlarged; figures 14-17, 32-36, enlarged V/ 2 diame- 

 ters ; figures 27-31, natural size. 



PLATE XLIII. 



Figures 1-3. Galba cmarginata (Say). Isle Royale, Lake Superior (23992) 



4-8. Galba cmarginata (Say). Mud Lake, Aroostook Co., Maine 



(23670). 

 9. Galba emarginata (Say). Mud Lake (Second Eagle Lake), Aroos- 

 took Co., Me. Juvenile (23694). 

 10-11. Galba emarginata (Say). Square Lake Inlet, Aroostook Co., 

 Maine (23993). 



12. Galba emarginata (Say). Square Lake Inlet, Aroostook Co., Maine 



(23700). 



13. Galba emarginata mighelsi (Binney). Juvenile. Square Lake Inlet, 



Aroostook Co., Me. (23702). 

 14-21. Galba emarginata mighelsi (Binney). Square Lake Inlet, Aroos- 

 took Co., Me. (23698). 

 Figures natural size (9, 13, slightly enlarged). 



PLATE XLIV. 



Figures 1-3. Galba emarginata angidata (Sowb.). Houghton Lake, Mich. 

 Specimens compared with Sowerby's type in British Museum 

 (23704). 

 4-6. Galba emarginata angulata (Sowb.). Houghton Lake, Mich. (Coll. 



Walker). 

 7-9. Galba emarginata angulata (Sowb.). First of Four lakes, Madison, 

 Wis. (23707). 

 10-18. Galba emarginata wisconsinensis (Baker). Tomahawk Lake, Wis. 

 Types (24504). Showing variation from elongated to depressed 

 spire. 

 19-23. Galba emarginata canadensis (Sowb.). Crooked Lake, Emmet 

 Co., Mich. (23712). 



Figures natural size. 



PLATE XLV. 



Figure 1. Galba emarginata canadensis (Sowb.). Immature. Owasco Lake, 

 N. Y. (23679). 

 2-10. Galba emarginata canadensis (Sowb.). Owasco Lake, N. Y. 



Showing extremes of variation (23678). 

 11-13. Galba emarginata canadensis (Sowb.). Owasco River, X. Y. 



(23682). 

 14-15. Galba emarginata canadensis (Sowb.). Bear Lake, Mich. (23713). 

 16-17. Galba emarginata canadensis (Sowb.). Bear Lake, Mich. (24548). 

 18-20. Galba emarginata canadensis (Sowb.). Bear Lake, Mich. (23714). 



