136 



due W. S. Blatchley, State Geologist; Dr. J. T. Scoville, Terre Haute High 

 School; Dr. C. H. Eigenmann, State University, Bloomington ; Mr. Harry 

 Dodge, Charleston, Indiana, and Mr. Charles Dunn, Chicago. 



The specimens which have been seen are mainly the most common forms. 

 In some few cases they have been found to be widely distributed over the State; 

 others are, apparently, confined to the Ohio and its principal tributary stream, 

 the Wabash. North of the divide that separates the Ohio and lake drainages 

 fewer forms of Unionidce occur, but the limiup id fauna appears to represent both an 

 increased number of individuals and of species. The land shells of the Ohio 

 drainage are both more abundant and varied. But no really final generalizations 

 can yet be ventured in the absence of extended collecting and large numbers of 

 shells — a condition which the present activity of members in this branch of the 

 State's biological survey indicates to be very remote. The facts collected for the 

 year past are the foHowing: 



Land Mollusc a. 



Mesodon albolabris Say. 



Charleston, Terre Haute, Indianapolis, New Albany. 

 Mesodon dausus Say. 



Vigo County, Indianapolis, Peru. 

 Mesodon elevatus Say. 



Terre Haute, Indianapolis, Corj'don. 

 Mesodon exoletiis Binney. 



Vigo County, Indianapolis. 

 Mesodon mvitilineatus Say. 



Terre Haute, Indis'napoHs. 

 Mesodon profundus Say. 



Charleston, Indianapolis, Terre Haute. 

 Mesodon thynoides Say. 



Vigo County, Indianapolis, Charleston. 

 Pa'ula alternata Say. 



Vigo County, Charleston. 

 Patula solitaria Say. 



Vigo County, Charleston. 

 Patula perspectiva Say. 



Vigo County. 

 Patula strmlella Anthony. 



Vigo County. 



