NO.1190. SHELLS OF HERON AND EAGLE LAKES— STEABNS. 137 



PLANORBIS BICARINATUS Say. 



Heron Lake (Oat. :N^o. 104465, U.S.KM.); Eagle Lake (Oat. E^o. 

 123897, U.S.N.M.). The 4 specimeus from the first-named place are 

 distinctly characteristic; from the last numerous examples were 

 obtained. 



PLANORBIS PARVUS Say. 



Heron Lake (Oat. No. 104461, U.S.KM.); Eagle Lake (Oat. No. 



123899, U.S.KM.). From each of the lakes, a few individuals weie 

 found in the general mass of material; apparently less common than 

 the larger species, 



PLANORBIS CAMPANULATUS Say. 



Eagle Lake (Oat. No. 123898, U.S.N.M.) ; two examples. 



PHYSA HETEROSTROPHA Say. 



Heron Lake; Eagle Lake (Oat. No. 123896, U.S.N.M.). From the 

 former several examples ; from the latter two rather undersized speci- 

 mens. 



PHYSA GYRINA Say. 



Heron Lake; a few specimens. 



BYTHINELLA OBTUSA Lea. 



Heron Lake (Oat. No. 104459, U.S.N.M.) ; Eagle Lake (Oat. No. 123902, 

 U.S.N.M.). Many examples from each of the lakes, but apparently 

 less frequent than the following: 



AMNICOLA CINCINNATIENSIS Anthony. 



Heron Lake (Oat. No. 104458, U.S.N.M.); Eagle Lake (Oat. No. 

 123901, U.S.N.M.). Abundant in Heron Lake, frequently of large size; 

 also common in Eagle Lake. 



VALVATA TRICARINATA Say. 



Heron Lake (Oat. No. 104460, U.S.N.M.); Eagle Lake (Oat. No. 



123900, U.S.N.M.). Exceedingly common aud of large size in Heron 

 Lake ; the median keel sometimes obsolete. Eight examples from Eagle 

 Lake. 



SUCCINEA OVALIS Gould. 



Near Heron Lake (Oat. No. 104466, U.S.N.M.). A single example of 

 this terrestial form was detected near the margin of the lake. 



SPHiERIUM STRIATINUM Lamarck. 



Heron Lake (Oat. No. 104467, U.S.N.M.) ; not uncommon. 



SPFiERIUM SOLIDULUM Prime. 

 Heron Lake ; many dead valves. 



