ANCYLUS. 227 



12. ANCYLUS KOOTANIENSIS, Baird. 



Plate 2, fig. 11, 12. 



Shell ovate, ashy, concentrically striate, 

 vortex anterior, obtuse, shining within. 



Length 9, width 6 mill. 



Kootanie and Spokane Rivers, British Co- 

 lumbia. 



I have not seen this species. Its ovate, 

 more depressed form appears to distinguish it 

 from Newherryi. 



13. ANCYLUS CRASSUS, Raid. 

 Hald. Monog. p. 14, t. 1, f. 8. 



14. ANCYLUS ALTUS, Tnjon. 

 Plate 2, fig. 13, 14. 



Shell somewhat oblong, broadly rounded at 



one end, more narrowly so at the other ; con- 

 (21) 16 



