THE NAUTILUS. 



Spliaerium striatinum (Lain.). 

 Musculium truncatuui (Lincl). 

 Valvata tricarinata Say. 

 Amnicola limosa (Say). 

 Amnicola lustrica (Pilsbry). 

 Physa heterostropha Say. 

 Fhysa integra Hald.. 

 Physa niagarensis Lea. 

 Planorbis trivolvis Say. 

 Planorbis campanulatus Say. 



Planorbis deflectus Say. 

 Segmentina armigera (Say). 

 Galba obrussa decani pi (Stivng). 

 Succinea retusa Lea. 

 Succinea avara Say. 

 Pyramidula cronkliitei anthonyi 

 Pilsbry. 



Zonitoides arborea (Say). 

 Vitrea rhoadsi Pilsbry. 

 Polygyra thyroides (Say). 



Planorbis campanulatus Say. 



Sandy beach on north side of Lake, water one to four feet deep. 



Alasmidonta calceola (Lea). Amnicola limosa (Say). 



Anodonta grandis footiana Lea. Amnicola lustrica Pilsbry. 



Anodonta marginata Say. Campeloma integra (Hald.). 



Anodontoides ferussacianus sub- Physa heterostropha Say. 



cylindraceus Lea. 



Pliysa niagarensis Lea. 

 Planorbis antrosus Conrad. 

 Planorbis parvus Say (dead). 



Lampsilis luteola (Lam.). 

 Lampsilis ventricosa (Barnes). 

 Valvata tricarinata Say. 



Marsh above marl bed, east of Magician Lake cottages. 

 Physa gyrina Say. Planorbis antrosus angistomus 



Aplexa hypnorum (Linn.). Hald. 



Paludestrina nickliniana (Lea). 



Heavy damp woods south side of lake. 



Succinea retusa Lea. Strobilops virgo (Pilsbry). 



Pyramidula cronkliitei anthonyi Polygyra thyroides (Say). 



Pilsbry. 



Zonitoides arborea (Say). 

 Vitrea hammonis (Strom). 



In swale in woods. 

 Sphaerium occidentale (Prime). 

 Aplexa hypnorum (Linn.). 

 Segmentina armigera (Say). 



Hemlock Island, west end of lake. The center of the island is 

 about twenty feet above the level of the lake. All shells were found 

 under old bark or fallen pieces of trees. 

 Succinea retusa Lea (found on Zonitoides arborea (Say). 



vegetation at margin of island). Vitrea indentata (Say). 



Polygyra monodon (Rackett). 

 Polygyra hirsuta (Say). 



Galba obrussa (Say). 

 Galba parva (Lea). 



