THE NAUTILUS. 



Vll 



Vertigo occidentalis Sterki, n. sp. (PI. XI, fig. 5) . 90,133 

 Vitrea alliaria . . . . . . . . .131 



Vitrea cellaria in Colorado . . . . . . .131 



Vitrea cellaria var. margaritacea Schmidt . . . .131 



Vitrea dalliana Simpson (figured) . . . . .129 



Vitrea fagalis Cockerell, n. sp. (miocene) . . . .89 



Vitrea lewisiana Clapp, n. sp. (figured) .... 129 



Vitrea lucida in Colorado .131 



Yemassee, South Carolina, Land and fresh-water shells of . 7 

 Zonitoides elegantula Pfr. . . . . . . .77 



Zonitoides pentagyra Pils., n. sp. (PI. Ill, figs. 6-8) . . 28 



