North American Helices. 



19 



Hopetonense Shuttl. 

 labyrinthicnm Lea 



is labyrinthicum Say. 

 Lecontii Lea 



is loricatum Gould, 

 loricatum Gould, 

 major Binn. 



is var. of albolabris Say. 

 monodon M. & R, 

 obstrictum Say. 

 oppilatum Mor. 

 palliatum Say. 

 pustulatum Fer. 



is pustula Fer. 



Roemeri Pfr. 

 Rugeli Shuttl. 

 Sayi Binn. 

 'spinosum Lea. 

 Texasianum Moric. 

 tridentatum Say. 

 Troostianum Lea. 

 uvuliferura Shuttl. 

 ventrosulum Pfr. 

 volvoxis Parr 



is var. of septemvoloa Say ? 

 vultuosum Gould, 



Subgen. Mesodon Raf. 



albolabrum Say. 

 appressum Say. 

 elevatum Say. 

 Michelianum Lea 



is Milchelianum Lea,. 



multilineatum Say. 

 Pennsylvanicum Green, 

 thyroides Say. 

 zaleta Say 



is exoleta Binn. 



Subgen. Polygyra* Say. 



fastigiatum Say 



is fastigans L. W. Say. 



profundum Say. 

 septemvolva Say. 



Gen. IhePilS Mont. 

 Subofen. Campylaea Beck. 



electrinus Gould 

 is viridula JSIenlc. 

 Syn. pur a Alder. 



sportella Gould 



is var. of Vancouverensis Lea. 

 strisfosus Gould, 



Subgen, Arianta Leach. 

 Townsendianus Lea. 



Gen. IlygTOIMia Risso.f 



Berlanderiana Moric. 

 griseola Pfr. 

 hispida L. 



planorboides Raf. 

 is eoncava Say. 

 ruf'escens Peun. 



* " Shell diseoidal, more or less earinated on the upper edge of the whorls, umbi- 

 licated ; aperture longer than broad ; lips thickened, toothed or folded and con- 

 tinued, folds concave beneath ; pillar-lip raised above the preceding whorl and 

 concave beneath." — Say Jour. Acad. I. 276. 1818. W. G. Binneijs Ed. p. 10. 



f In the Synonymy of Ilygromia is Fruticicola Held. — Gen. of Recent Moll. 

 I. c. 214. 



