Baker — The Molluscan Fauna of the Dells of Wisconsin. 103 



Systematic Catalog of Species. 



Class PELECYPODA. 



Family Unionidae. 



The following species were seen from the Lower Dells. 

 The height of the river prevented the collection of the fresh- 

 water clams, which were said to be common at low water. 



Lampsilis alata Say. 



Lampsilis gracilis Barnes. 



Lampsilis ligamentina Lamarck. 



Class GASTROPODA. 



Order PULMONATA. 



Suborder Basommatophora. 



Family Physidae. 

 Physa gyrina Say. 



Several specimens of this species were found in Cold Water 

 Canon, and in a small pond near the road which enters 

 Witches Gulch a large number were found. The shells are 

 very black. 



LlMNAEA DESIDIOSA Say. 



Abundant in small pond near Witches Gulch. 



Limnaea humilis Say. 



One specimen was found near Cold Spring. 



Suborder Stylommatophora. 



Family Cochlicopidae. 



Cochlicopa lubrica Miiller. 



A single specimen of this species was found by Mr. Wood- 

 ruff near Cold Spring. 



