TABLE OF DISTRIBUTION. 



317 



Species. 



Distribution in other parts of 

 the world. 



Aquitic {continued). 



Univalves. 



Noritina fluviatilis 



Paludina contecta 



vivipara 



Bytliinia tentaculata 



Leachii 



Hydrobia similis 



ventrosa 



Valvata piscinalis ........ 



cristata 



Planorbis lineatus 



nitidus 



Nautileus 



albus 



glaber 



spirorbis 



vortex 



carinatus 



complanatus 



corneus 



contortus 



Physa hypnorum 



fontinalis 



Liinnrea glutinosa 



involuta 



peregra 



auricularia 



stagnalis 



palustris 



truncatula 



glabra 



Ancylus fluviatilis . . 



lacustris 



Number of aquatic spe- 

 cies 47 



Terrestrial. 



Arion ater 



hortensis 



Geomalacus maculosus . . 

 Limax gagates 



marginatus 



flavus 



45 



45 



34 



Siberia. 



Siberia. Var, depressa, R.Lena. 

 Siberia and Kamtschatka. 



Siberia. 

 Siberia. 

 Siberia and Kamtschatka. 



■Siberia. 

 Siberia. 

 Siberia and mouth of the 



Eiver Ussuri. 

 Siberia. 



Siberia and Steppes of Kirgis. 

 Siberia. 



Siberia ; North America. 

 Siberia. 



Siberia ; Afghanistan. 



Siberia. 



Siberia. 



Siberia and Kamtschatka. 



Siberia ; Afghanistan. 



Irkoutsk. 



Siberia. 



