410 THE CHICAGO ACADEMY OF SCIENCES. 



basal, a little longer than wide, but nearly circular, the inner 

 margin a trifle straightened above; peristome continuous, in 

 contact with the preceding whorl for an extremely short dis- 

 tance above. Operculum Amnicoloid." 



Alt. 3, diam. 2; length of aperture, 1#; width l l /i mm. 



" 2K, " 2 1 A\ " " 1.08; " 1 " Pilsbry. 



Animal: Not examined. 



Radula : Amnicoloid. (Pilsbry.) 



Distribution: "Lake Michigan at High Island Harbor, 

 Beaver Island, at 19 meters depth; Reed's Lake, Grand Rap- 

 ids, Mich.; River Rogue, Wayne Co., Mich.; the types from the 

 first locality mentioned." (Pilsbry.) Joliet, 111. (J. H. Fer- 

 riss.) 



Geological distribution: Pleistocene. 



Habitat: Similar to other Amnicola. 



Remarks: This, one of the smallest of Amnicolae, has re- 

 cently been found at Joliet by Mr. J. H. Ferriss. It will be 

 easily known by its small size and peculiar shape. 



