TABLE OF DISTRIBUTION. 



317 



Species. 



a 



o 



Aqua,tic {continued). 



Univalves. 



Neritina fluviatilis 



Paludina contecta 



vivipara 



B jtliinia tentaculata .... 



Leacbii 



Hydrobia similis 



ventrosa 



Valvata piscinalis 



cristata 



Planorbis lineatus 



nitidus 



Nautileus 



albus 



glaber 



spirorbis 



vortex 



carinatus , 



complanatus 



corneus 



contortus 



Physa hypnorum 



fontinalis 



Limna^a 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 



a 



u 



o 



45 



a- 2 



45 



34 



Distribution in other parts of 

 the world. 



Siberia. 



Siberia. Var. depressa, R.Lena. 

 Siberia and Kamtschatka. 



Siberia. 

 Siberia. 

 Siberia and Kamtscliatka. 



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. 



