I 



HANNIBAL: CALIFORNIAN FRESHWATER MOLLUSCA. 145 



F. C. Baker, 1905 ; L. Oivascaensis, P. C. Baker, 1905 ; L. Lalli, 

 F. C. Baker, 1906; L. Alamosensis, Arnold, 1907; L. cyclostoma, 

 Walker, 1908 ; Galba Doddsi, F. C. Baker, 1911 ; G. bulimoides 

 {partim), F. C. Baker, 1911. 

 Shell of small or moderate size for group, spire elevated or acuminate, 

 wliorls well iuflated and umbilicate, aperture roundly auriculii'oim, 

 pillar showing no trace of columellar fold, the reflection of the inner 

 lip broad ; habitat generally in marshy situations about lakes or 

 streams, also in mountain brooks and springs, frequently in green- 

 houses. 



Entire Palfearctic and Nearctic Regions, extending south into 

 mountainous portions of Mexican Province. 



Quaternary : Loess of eastern States ; Lahontan Lake beds, Nevada ; 

 calcareous spring deposit, Los Alamos Yalley, and alluvial deposits of 

 San Soaquin Valley, California. ]\Iiocene : Contra Costa Lake beds, 

 California. 



Lymn^a (Galba) obrdssa (Say). 



Lynmem ohrusms, Say, 1825; L. (j alb anus ^ Say, 1825; L. plica. Lea, 



1841; L. exigua, Lea, 1841; i. Philadelphica, Lea, 1841; 



L. planulata, Lea, 1841; Limncea ferruginea, Haldeman, 1841; 



L. acuta, Haldeman, 1842 ; L. desidiosa {partim)^ Haldeman, 184 2 ; 



Z. desidiosa, var. Decampi, Streng, 1896; L. 'Adelines, Tryon ', 



Pilsbry, 1898; Z. trwicatula, Dall, 1905 {partim) ; L. desidiosa, 



xar. peninsulce, Walker, 1908. 



Shell of moderate size, spire elevated or acuminate, whorls somewhat 



inflated, sub-perforate, aperture narrowly auriculiform, columellar fold 



nearly or entirely obsolete ; liabitat streams and lakes on floating 



algfe or along shore, generally Vnxt partially immersed, mountain 



brooks. 



Boreal portions of Nearctic Region extending south to Colorado in 

 Rocky Mountains. Columbia, Utah, and Klamath Systems. 



Quaternary: Loess of eastern States ; Bonneville Lake beds, Utah. 

 Reported from Mexico ; the record will doubtless prove to have 

 been founded on the preceding species. As with solida and the 

 European glabra, this Lymnaeid is barely beyond the Zgninaa stage and 

 luirdly a typical Galba. 



Lymn^a (Galba) caperata (Say). 



Lijmnens caperatus. Say, 1829 ; Z. Smithsoniana, Lea, 1866; Limncea 

 Ferrissi, F. C. Baker, 1902 ; Z. timbilicata, Cubensis, Pingelei, and 

 opacina (error for apicina) of authors. 



Shell of moderate or large size for group, spire bluntly acuminate 

 or sub-pupiform, whorls inflated, marked by spiral fringes of epidermis, 

 and umbilicate, aperture roundly auriculiform, pillar with an obsolete 

 columellar fold ; habitat moist places in the vicinity of lakes and 

 sloughs. 



Boreal portion of American Province. 



Frequently reported from portions of the Californian Province. 

 The records, so far as they have been verified, have proved to have 



