HANNIBAL: CAMFORNIAN FUESHWATICK 5I0LLUSCA. 165 



I'lnjsa fontinalis. Sliell of aiodLiate size, spire ratlier obtuse, whorls 

 iufliited, sutures somewhat impressed, columella short and obli(iuo; 

 habitat everj^where in aquatic situations. 



Boreal portion of European Province and Nearctic l^cgion. Yukon, 

 Alaska, Fraser, Columbia, Klamath, Utah, jSTevada, and Coast Range 

 Systems, occasionally farther south. 



Quaternary : Loess of eastern States ; post-Glacial deposits of 

 Vancouver and San Juan Islands. 



Physa fontinalis acuta. Shell similar to fontinalis, but the wliorls 

 slightly more inflated, the sutures deeper, and the columella long and 

 straight, with a rudimentary fold ; fontinalis stage passed during late 

 adolescence ; habitat same. 



Temperate and sub-tropic portions of European Province and 

 Nearctic Region ; IMexican and Antillean Provinces. TJtali, Nevada, 

 Khnnath, Coast Range. Los Angeles, Mojave, Colorado, and Arizona 

 Systems, infrequently farther north. 



Quaternary: Bonneville Lake beds, Utah; Lahontan Lake beds, 

 Nevada; marls of Santa Rosa Island, alluvial deposits of San Joaquin 

 Valley, and San Pedro Formation (specimens washed into marine 

 terraces), California. Pliocene : Kettleman, Cache, and Santa Clara 

 Lake beds, California. 



For those writers who fondly believe that nothing of importance 

 has been done by the Europeans that will assist in the classification 

 of the New World molluscs, a consultation of Moquin-Tandon's 

 Histoire Naturelle des 3IoUusques terrestres et fluviatiles de Franca in 

 this connexion is suggested. That work was written in 1855-6 at 

 a time when writers on American conchology had contributed but 

 a score or so of synonyms to fontinalis and its sub-species, instead of 

 the ten score which now burden the literature, yet the characters used 

 there to distinguish the species are identical with those suggested by 

 the writer, quite independently, two years ago, and, except that acuta 

 is given sub-specific rather than full rank, the nomeuclature accepted 

 in these pages follows tlie French author closely. 



Physa nrPNORDM (Linne). 

 Bulla hypnorum, Linne, 1758 ; Bulinus Tryoni, Currier, 1867. 



Shell of moderate size, spire acute, whorls rather appressed, sutures 

 not appreciably impressed, columella short and oblique ; habitat lakes, 

 rivers, and slouglis. 



Boreal portions of American and European Provinces. Yukon, 

 Utah, and locally in Columbia System. 



