257 



formation possible."* A recent writer proposes** the same explanation for tlie 

 distribution of the two faunas in this region and, from the facts we have herein 

 adduced, the locality ofters most excellent opportunities for a careful study of the 

 problem. Yet, the fact of the artiticial connection of these two areas must con- 

 stantly be borne in mind. A second region where the heads of the drainage areas 

 are practically coincident occurs in Kosciusko County, where the several small 

 lakes and general low-lying region are all drained by streams whicli How either 

 into the Tippecanoe or the Turkey rivers, the first of which is tributary to the 

 Wabash, the second to the St. .Joseph's, of Michigan. A low moraine separates 

 the two basins. This is the location of the Biological Station of the State Uni- 

 versity which will, jjresumaldy, interest itself in this ((uestion. 



An investigation of the fauna of the Upper Wabash that would be complete 

 might disclose others of the eastern species in its waters. Strong corroborative 

 evidence might be secured through the ichthyic fauna of the two rivers, the Wa- 

 bash and the Maumee, for, if the suggestions of this paper are tenable, some de- 

 gree of correspondence should be disclosed by a study of the fishes. This corre- 

 spondence, if it exists, will aid in understanding the method of distribution of the 

 Unionidii which is so largely effected through the medium of fishes. 



-Vide, Call, " Fifth Contribution to a Knowledge of the Fresh-Water MoUusea of Kan- 

 sas," Bull. Washburn College Laboratory of Nitural History, vol. i. No. 6, pp. 178, 179, 1886. 



**Sinipson, "On the Mississippi Valley Unionida; Found in the St. Lawrence and At- 

 lantic Drainage Are:i.<." American Naturalist, vol xxx, pp. o79-384, 189ti. 



