BUFFALO SOCIETY OF NATURAL SCIENCES 243 



Physa heterostropha Say. Universal in all stations. 

 Physa integra Hald. Lancaster, E. Aurora, West Falls, 

 Frenchman's ck. 



Physa niagarensis Lea. Lake Erie, Niagara riv. 

 Aplexa hypnorum Linn. Williamsville, Concord. 

 Planorbis campanulatus Say. Lime Lake, Niagara riv. 

 Planorbis trivolvis Say. Universal in all stations. 

 Planorbis bicarinatus Say. Universal in all stations. 

 Planorbis exacutus Say. Concord, Lime Lake, Cayuga Isl., 



Erie Canal. 

 Planorbis dilatatus Gld. Lime Lake. 

 Planorbis albus Mull. Erie Canal. 

 Planorbis parvus Say. Ft. Erie Trenches, Frenchman's ck., 



Lime Lake, Williamsville, Lewiston, Chippawa. 

 Planorbis umbilicatellus Say. Ft. Erie Trenches, Squaw Isl. 

 Segmentina armigera Say. E. Aurora, Strickler's, Lewiston. 

 Ancylus parallelus Hald. Chippawa. 

 Ancylus tardus Say. E. Aurora. 

 Ancylus eugraptus Pils. Squaw Isl.. E. Aurora. 

 Sphaerium simile Say. Ft. Erie Trenches, Niagara riv. , E. 



Aurora, Chippawa ck. 



Sphaerium rhomboideum Say. Erie Canal. 

 Sphaerium striatinum Lam. Cazenovia ck. , Niagara riv., 

 Ft. Erie Trenches, Chippawa ck. 



Sphaerium solidulum Pr. Niagara riv. 



Sphaerium occidentale Pr. Ft. Erie Trenches, Cazenovia ck., 



Concord, West Seneca, Lewiston. 

 Sphaerium stamineum Conr. Cazenovia ck., Chippawa ck., 



Williamsville. 

 Sphaerium fabale Pr. Niagara riv. 

 Calyculina transversa Say. Cazenovia ck., Buffalo (So. Og- 



den st.) 

 Calyculina partumeia Say. Ft. Erie Trenches. 

 Calyculina truncata Say. So. Bfo. bet. Ry. tracks, Concord. 

 Calyculina securis Pr. Ft. Erie Trenches, So. Buffalo, Lime 



Lake, Chippawa ck. 



