139 



opposite Louisville. They present a still wider range of variation, per- 

 haps from the character of their habitat. The very wide range of vari- 

 ation suggests some interesting synonymic conclusions that it is hoped 

 will be elaborated during the coming year. 

 Goniobasis pulchella Anthony. 



Wabash Kiver, Ohio River at the Falls, Turkey Creek. 



Widely distributed over the State, and with Goniobasis iivescens Menke, 

 ranges farthest north. 

 Goniobasis Iivescens Menke. 



Turkey Creek, St. Joseph Kiver. 

 Goniobasis sp. 



A very great quantity of these small shells were collected by me at the Falls 

 of the Ohio during the past three years, but opportunity to work it up 

 has not yet been afTorded. As in the pleuroceroid section, this material 

 promises an abundant synonymy. 

 Lioplax subcarinata Say. 



Wabash River, Ohio River. 

 Vivipara infertezta Say. 



Wabash River, Gibson County, Lake Maxinkuckee. 

 Vivipara contectoides Binney. 



Lake Maxinkuckee, ponds along Wabash River. 

 Campeloma deci-ium Say. 



St. Joseph River, Lake Maxinkuckee. 

 Campeloma ponderosum Say. 



Ohio River, Wabash River, ponds in Vigo County. 

 Campeloma rufum Haldeman. 



St. Joseph River. 

 Campeloma subsolidum Anthony. 



Peru, Lake Maxinkuckee, White River. 



The very interesting and very difficult group of shells comprised in Campeloma 

 is probably the least understood and the most abused of any in the North 

 American fauna. .Vt brief intervals some tyro arises to declare his "discovery 

 that after all there is but one species," etc., etc., the latest of these being a writer 

 in the "Proceedings of the Iowa Academy of Sciences."* In this paper the 

 remarkable suggestion is confidently made that " Mr. Binney's disposition of 

 these forms is still the best." Xow, Mr. Binney wrote on these mollusks thirty 



* Proc. Iowa Acad, of Sciences, 1893 fl894], p. 108. Shimek, " Additional Notes on Iowa 

 Mollusea." 



