West Virginia Polygyrid Snails 



151 



Figs. 13-17. County distributions of Mesodon in West Virginia. 13, M. pen- 

 nsylvanicus; 14, M. mitchellianus; 15, M. clausus; 16, M. rugeli; 17, M. inflect- 

 us. Fig. 18. County distribution of Stenotrema hirsutum in West Virginia. 



