198 



BULLETIN OF THE 



couverensis extend along the mountains southeasterly into Idaho and 

 Montana. The former two become much dwarfed in size at their most 

 eastern range. 



(b.) The Californian Region extends from Humboldt Bay to San 

 Diego, between the Sierra Nevada and Cascade Mountains on the east, 

 and the Pacific Ocean on the west. 



The following are the species peculiar to it : — 



Macrocyclis Voyana. 

 Duranti. 

 Vitrina Pfeifferi. 

 Zonites Whitneyi. 

 conspectus, 

 chersinellus. 

 Limax Hewstoni. 

 Binneia notabilis. 

 Ariolimax Californicus. 



niger. 

 Arion ? Andersoni. 

 Helix Yatesii. 



Harfordiana. 



loricata. 



infumata. 



Hillebrandi. 



arrosa. 



Nickliniana. 



Ayresiana. 



redimita. 



intercisa. 



Helix exarata. 



ramentosa. 



Californiensis. 



Diabloensis. 



Carpenteri. 



Mormonum. 



sequoicola. 



Traski. 



Dupetithouarsi. 



ruficincta. 



Gabbi. 



facta. 



Kelletti. 



Tryoni. 



Newberryana. 

 Pupa corpulenta. 



Rowelli. 



Californica. 

 Succinea Sillimani. 



Stretchiana. 



Of the above, several species extend beyond the limits of the region. 

 Thus, Vitrina Pfeifferi, Zonites Whitneyi, Pupa corpulenta, Succinea 

 Sillimani, Succinea Stretchiana, and S. rusticana are found also on 

 the western slope of the Sierra Nevada in the Central Province. Helix 

 infumata and Macrocyclis Voyana are also found outside the bounds of 

 the Region, in the Oregonian Region. 



.With the fauna of Lower California there seems no connection, unless 

 Helix Stearnsiana proves identical with H. Kelletti, in which case the 

 former must be considered as belonging to the Lower California fauna 

 rather than to that of our Pacific Province. Another species, H. Car- 

 penteri, is included in the above list, having been cpioted from San Diego 



