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 Newberryt. 
13. ANCYLUS CRASSUS, Hald. 
Hald. Monog. p. 14, t. 1, fi 8. 
14. ANCYLUS ALTUS, Tryon. 
Plate 2, fig. 13, 14. 
Shell somewhat oblong, broadly rounded at 
one end, more narrowly so at the other; con- 
(21) 16 
