ANCYLUS OBSCURUS, Hald. 



Plate 1. — Fig. 5. 

 A. testa brunnea, ovata, latiuscula, subelevata. 



DESCRIPTION. 



Shell ovate, somewhat elevated, rather wide, 

 apex but sHghtly projecting, rather more than 

 one-third of the shell posterior: lateral margins 

 slightly convex: lateral slopes rectilinear; pos- 

 terior slope with a very slight depression; ante- 

 rior slope nearly rectilinear. 



Color dark brown, margin diaphanous. 



Dimensions. Long. 5, lat. 3.5, elev. 1.5 mill. 



Geographical Distribution. Found in No- 

 lachucky river, below Greenville. 



observations. 



Rather wider than A. rivularis and depressus; 

 more depressed than the former, and lighter 

 colored than the latter. A single specimen was 

 obtained, of which the margin is defective. 



L 2 



