[891.] WALTON— MOLLUSC A OF MONROE COUNTY. 



Family HELICIDiE. 



Mesodon albolabris, Say. Rochester. 



Helix rufa, De Kay. (immature sp. ) 

 Mesodon albolabris var. dentata. Pittsford. 

 Mesodon thyroides, Say. Rochester. 



Anchistoma .thyroides, H. and A. Ad. 



Helix bucculenta, Gld. 

 '' thyroides, Pfr. 



Mesodon bucculenta, Tryon. 

 Mesodon Sayii, Bin. .Pittsford. 



Helix diodonta. Say. 

 " Sayii, Bin. 



Ulostoma Sayii, Tryon. 

 *Tachea hortensis, Mull. East Rochester. 



Helix subglobosa, Bin. 



" De Kay. 

 Triodopsis palliata, Say. Pittsford. 



Helix denotata, Fer. 

 " notata, Desh. 



Xolotrema palliata, Tryon. 

 Triodopsis tridentata, Say. Rochester. 



Triodopsis lunula, Raf . 

 Triodopsis fallax, Say. Rochester. 

 Vallonia pulchella, Miill. Pittsford. 



Helix fninuta. Say. 

 " costata, Miill. 



Vallonia minuta, Morse. 



Tryon. 



Stenotrema hirsuta, Say. Rochester. 



Triodopsis hirsuta. Woodward. 



Helix fraterna, ^^'ood. 

 " porcina. Say. 

 Stenotrema monodon, Rac. Rochester. 



Helix convexa, Chem. 



Helicodonta hirsuta, Fer. 

 Stenotrema monodon var. fraterna, Say. Rochester, 

 Stenotrema monodon var. Leaii, Ward. Rochester. 



*This is an European species and was picked up near Vick's greenhouses. It was in ray 

 possession alive for several days. Possibly it was brought over with some bulbs or plants from 

 England or France. 



