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HELICELLINiE. 



Genus HELICELLA, Lamarck. 



Tentacles short ; edge-teeth of tongue aculeate. Mantle 

 thickened and slightly reflected ; tail ohliquely truncated. 



Shell depressed, vitreous, shining, umhilicated ; whorls 

 regularly increasing, the last not descending at the aperture ; 

 aperture rotundately lunar ; peristome thin, straight. 



8yn. Hyalina, Ferus., not Schum. Zonites, Gray, not 

 Montf. Polita, Held. Vitrea, Fitz. Hyalinia, Ay ass. 



Ex. H. cellaria, Midler, pi. 71, fig. 8. Shell, H. cel- 

 laria, fig. 8, a. 



The Helicelhe are small Snails, most frequently with 

 transparent shells, inhahiting the damp moss and dead leaves 

 in woods and shady places in Europe, North America, and 

 the West Indies. 



Species of Helicella. 



alliaria, Mull. 

 arborea, Say. 

 Besckei, Dkr. 

 bilineata, Pfeiff. 



Boothiana, Pfeiff. 

 caduca, Pfeiff. 

 Cayennensis, Pfeiff. 

 cellaria, Mull. 

 cicercula, Gould. 

 circumlineata, Rust. 

 crystallina, Mull. 

 cyclostomoides, Pfeiff. 

 Cypria, Pfeiff. 

 demissa, Binney. 

 fricata, Gould. 

 fuliginosa, Griff. 

 fascosa, Ziegl. 



Haldemanniana, C.B. Adams. 

 hiulca, Jan. 

 hyalina, Ferus. 

 hydatina, Rossm. 

 inoruata, Say. 

 intertexta, Binney. 

 laevigata, Bafin. 

 ligera, Say. 

 minuscula, Binney. 

 nitens, Mich. 

 nitida, Mull. 

 nitidula, Drop. 

 ohscurata, Porro. 

 olivetorum, Gmel. 

 opaca, Shuttl. 

 peraffinis, C. B. Adams. 

 pertenuis, Gould. 



