MOLLUSCA OF OHIO. 401 



FOSSILS. 



Fossil land and fresh-water mollusca have been collected 

 only at few places in Ohio. Younger and older deposits should 

 be carefully searched for them. 



In the "preglacial deposits" near Middletown, first bottoms 

 on the Miami River, examples of the following species have been 

 collected.* 

 Helix elevata Say. Helix solitaria. 



concava Say. " tridentata. 



alternata Say. Goniobasis depygis. 



hirsuta Say. Planorbis trivolvis. 



monodon Rackett. Amnicola lapidaria Say. 



thyroides. Succinea sp. 



profunda Say. 



In the "Old Forest Bed" of the Ohio River, a layer of 

 vellow clav, Mr. A. C. Billupst has collected the following species: 

 Vallonia pulchella Muller. Traces. 

 Polygyra tridentata Say. Scarce. 



var. Region of the mouth much depressed, 

 and very deeply striated. 

 inflecta Say. Few. 

 profunda Say. Very large, heavy. 

 albolabris Say. Very scarce. 

 exoleta Binney. Very common, but not found alive 



within twenty miles of this deposit. 

 multilineata Say. Most common. (Same note as of 



preceding.) 

 palliata Say. 

 appressa Say. 



elevata Saw Fairly common. 

 pennsylvanica Green. Common; rare in the vicinity 



alive. 

 thyroides Say. Rather common. 

 mitchelliana Lea. Common, rare alive. 

 stenotrema Fer. 

 monodon Rackett. Very rare. 

 Pupoides marginatus Say. 

 Bifidaria contracta Say. 



armifera Say. Common. 

 Cochlicopa lubrica Mtiller. 

 Circinaria concava Say. Common. 

 Vifrea hammonis Strom. Several examples. 



* See Geological Survey of Ohio, Vol. Ill, "Warren and Butler Counties 

 4 The Nautilus XVI, p. 50. (Sept.. 1902). 



