402 OHIO STATE ACADEMY OF SCIENCE. 



Gastrodonta ligera Say. Common. 

 Pyramidula alternata Say. Very large. 



solitaria Say. Plentiful, large. 



" perspectiva Say. Rare. 



" striatella Anth. Rare. 



Helicodiscus lineatus Say. Rare. 

 Succinea sp. Very large. 

 Pomatiopsis lapidaria. Common. 



Four miles east of Defiance, in a sandy deposit (loess?), 

 forming the north bank of the Maumee River, at the state dam, 

 I have collected ,Oct. 27, 1906, the following 27 species:* 



Gastrodonta ligera Say. 

 Zonitoides arboreus Say. 



laeviusculus Sterki. 

 Hyalina radiatula Alder. 



" indentata Say. 

 Circinaria concava Say. 

 Poly gyra profunda Say. Common. 



multilineata Say. Common. 



" albolabris Say. 



" zaleta Binney. 



" clausa Say. 



" mitchelliana Lea. 



" thyroides Say. 



" elevata Say. The commonest of the Poly gyra. 



" fraudulenta Pilsbry. 



" inflecta Say. 



" hirsuta Say. 



Patula solitaria Say, common. 

 alternata Say. 



" striatella Anthony. 

 Bifidaria contracta Say. 

 Succinea avara Say. 



" retusa Lea, or near. 



Physa sp. (one specimen, broken to fragments). 

 Pomatiopsis lapidaria Say. Abundant. 

 Pisidium compressum Prime. 

 fallax Sterki. 

 Of Unionidae, fragments were common, but all too small to 

 be identified. 



* Since I had chance to collect there only once, and during a short 

 time, notes with respect to frequency and scarcity are insufficient. There 

 is no doubt that many other species will be found in that deposit, which 

 probably has a wide extension. 



