THE NAUTILUS. 101 



Zoniioides nitida Miilier. Abundanl in low, wet li^lils. 



Zonitoides arborea Say. Common. 



Euconulus fulvus Miilier. Rare, found tour. 



Gastrodonta ligera Say. Abundant, woods. 



Gastrodonfa multidentata Binney. Rare. 



Pyramidula alternata Say. Abundant everywhere. One speci- 

 men is turreted, baving a sharp angle at the periphery, and the 

 suture placed far below the angle. 



Pyramidula striatella Anthony. Rare. 



Pyramidula perspectiva Say. Rare, west side of lake. 



Helicodiscus lineatus Say. Rare. 



Poly (j yr a tridentata Say. Common. 



Polygyra sayi Binney. Rare, 8 on 1 sq. yd. No others found. 



Polygyra albolabris Say. Abundant. 



Polygyra albolabris dentata Walker. Rare. 



Polygyra exoleta Binney. Rare. 



Polygyra palliata Say. Common. 



Polygyra thyroides Say. Common. 



Polygyra hirsuta Say. Rare 



Polygyra monodon Racket. Rare. 



Polygyra monodon fratema Say. Common. 



Vallonia pidchella Miilier. Common. 



Circinaria concava Say. Rare. 



Pupoides marginata Say. Ra»*e. 



Vertigo ovata Say. Rare. 



Vertigo ventricosa Say. Rare. 



Cochlicopa lubrica Miilier. Abundant. 



Bifidaria corticaria Say. Rare. 



Bifidaria contractu Say. Common. 



Bifidaria armifera Say. Rare. 



Bifidaria pentodon Say. Rare. 



Strobilops labyrinthica Say. Rare. 



Succinea obliqua Say. Abundant. 



Succinea obliqua totteniana Lea. Rare. 



Succinea retusa Lea. Common. 



Succinea avara Say. Common. 



