THE NAUTILU?. 



Subg. Isthmia Gray.® 



P. calamitosa Pilsb. South (and Lower) Cal. 

 P. hemphilli Sterki. South (and Lower) Cal. 

 P. Clementina Sterki. San Cleniente Id., Cal. 



Suhg. Angustula Sterki.' 

 P. milium GId. All eastern N. A. 



Subg. . 



P. dalliana Sterki. Lake Co., Cal. 



Vertigo Miill.* 



Subg. . 



V. variolosa Gld. Fla. 

 V. sp. San Diego, Cal. 



Subg. Nearctula Sterki. 



V. californica Row., type. Cal. (near San Francisco). 



var. elongata Sterki. San Clemente Id. 



var. catalinaria Sterki. San Clem, and Catalina Ids. 



var. diegoensis Sterki. San Diego. 



var. trinotata Sterki. Monterey. 



var. Cyclops Sterki. Placer Co. 

 V. rowelli Newc. Cal. 

 V. decora Gld. North. 

 V. corpulenta Mse. Rocky Mountains. 

 V. castanea Sterki. Lake Co., Cal. 

 V. borealis Mor. Alaska. 

 V. ingersolli Anc. (californica Ing.). Colo. 



var. haydeni Anc. Cunningham Gulch. 



var. accedens Anc. 

 V. coloradensis Ckll. Colo. 

 V. hoppei Moell. Greenland, Anticosti. 

 V. Columbiana Sterki mss. Wash., different places. 



var. utahensis Sterki mss. Utah. 



Subg. Vertigo s. str. 



V. binneyana Sterki. Manitoba to N. M. 

 V. pygmiea Drp. Northeast. 

 var. callosa Sterki. Ohio. 



