OF NORTH AMERICA. 531 



28-29. Galba apicina (LEA). Menominee River, Mich. (Coll. Walker, 



22891). 



30. Galba apicina solida (LEA). Salmon River, Idaho. (Coll. Hemphill). 

 31-35. Galba hinkleyi (BAKER). North Fork Snake River, Idaho. TYPES 



(23720). 

 Figures 4-12, 14-17, natural size; figures 1-3, 13, 18-35, slightly enlarged. 



PLATE XLVIII. 



Figure 1. Galba apicina (LEA). TYPE. (Smith. Inst, 118626). 



2. Galba apicina solida (LEA). TYPE. (Smith. Inst., 118713). 



3. Galba binneyi (TRYON). East of Colville, Wash. (Part of No. 9320, 



Smith. Inst.). 



4. Galba glabra (MULLER). Europe. (23681). Type of subgenus Lepto- 



limncza. 

 5-8. Galba randolphi (BAKER). Lake Lindeman, Yukon Territory. 



Young and immature (23092). 

 Figures 9-12. Galba randolphi (BAKER). Marsh Lake, Dyea Valley, Yukon. 



(TYPES, 23090). 



13-14. Galba atkansis (DALL). Alaska Moll., pi. II, figs. 7, 9. TYPES. 

 Figures 1-3, natural size; figures 4-8, enlarged 2 1/2 diameters; figures 9-12, 

 enlarged 1 1/3 diameters ; figures 13-14, enlarged 1 3/4 diameters. 



PLATE XLIX. 



PROTOCONCH OR NUCLEUS. 



(Greatly magnified.) 



A. Lymncea stagnalis appressa SAY. 



B. Bulimnea megasoma (HALDEMAN). 



C. Galba bulimoides techella (HALDEMAN). 



D. Galba truncatula (LINNE). 



E. Acella haldemani ((DESK.) BINNEY). 



F. Lymnaa stagnalis appressa SAY. View of whorls from above. 



G. Galba petoskeyensis (WALKER). 

 H. Galba parva (LEA). 



I. Galba bulimoides techella (HALD.). 



J. Galba catascopium (SAY). 



K. Galba palustris (MULLER). 



L. Galba danielsi (BAKER). 



M. Galba proxima (LEA). 



N. Galba jacksonensis (BAKER). 



O. Galba nasoni (BAKER). 



P. Galba binneyi (TRYON). 



R. Galba randolphi (BAKER). 



PLATE L. 



Small brook near Glencoe, Illinois. Habitat for Galba caperata (SAY). 

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



