A MANUAL OF AMERICAN LAND SHELLS. 21 



Avion f Andersoni. Arionta Mormonum. 

 Gonostoma Yafesi. , sequoicola. 



Triodopis loricata. • TrasM. 



Polygyra Harfordiana. Dupetithotiarsi. 



Agloja infumata. ruficincta. 



Rillehrandi. Gdbhi. 



Arionta arrosa. Kelletti. 



exarata. Stearnsiana. 



Galiforniensis. Euparyplia Tryoni. 



Californiensis var. ra- Glyptostoma Newberryanum. 



mentosa. Pupa RoweUi. 



var. Nicldiniana. Galifornica. 



Ayresiana. Succinea Sillimani. 



inter cisa. Stretcliiana. 



Diahloensis. Veronicella olivacea. 



Carpenteri. 



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

 Thus, Vitrina Pfeifferi, Zonites Whitneyi, Succinea Sillimani, Succifiea 

 Stretchiana, and ;S^. rusticana are found also on the eastern slope of the 

 Sierra I^evada in the Central Province. Aglaja infumata and Macro- 

 cyclis Voyana are also found outside the bounds of the region, in the 

 Oregonian Eegion. 



The geographical distribution of the above species of Arionta is very 

 peculiar. Arionta Mormonum is found in the Sierra Nevada counties, 

 as is also tudiculata; but the latter is also found near the coast in the 

 southern counties. All the others are restricted to the coast counties, 

 ranging as stated in the descriptive portion of the work, the following 

 being island species: A. ruficincta, Gabbi, intercisa, Ayresiana, and 

 Kelletti. A. Stearnsiana and A. Carpenteri are Lower Californian 

 species. 



Of the remainder of the above list all are restricted to the vicinity of 

 the coast {Binneya is an island species), except the following from the 

 Sierra IsTevada counties : Vitrina Pfeifferi, Zonites Whifneyi, Z. chersinel- 

 lus, Gonostoma Yatesi, Polygyra Harfordiana, and Aglaja Hillebrandi. 



With the fauna of Lower California there seems no connection, 

 though one or two species overlap at the dividing line, as Arionta 

 Stearnsiana. Another species, A. Carpenteri, is included in the above 

 list, having been quoted from San Diego and Tulare Valley, California. 



