North American Helices. 25 



21. Vallonia Risso. 



pulchella Miill. 



a. costata. 



b. pulchella. 



23. Fruticicola Held. 



Type. H. hispida L. 

 rufescens Penn. hispida L. 



37. Arionta Leach. 



Type. H. arbustorum L. 

 Townsendiana Lea. 



52. Polymita Beck. 



Type. II. muscarum Lea. 



varians Menke. submeris Migh. 



is varians Menke. 



Looking at the lists of Albers, I do not understand why H. 

 caduca Pfr. should not be in the same genus with ftdiginosa, 

 etc. II. labyrinthica Say, with reflected lip, is in Gastrodonta 

 (sub-gen. of Hyalina), but the characteristic peristome both of 

 genus and sub-genus, as described, is of the one " tenue, acu- 

 tum, rectum," and of the other, " simplex, acutum." Pfeiffer 

 {Maldk. Blatt.) has this species in Mesodon. II. sportella Gould, 

 in my opinion, var. of Vancouverensis Lea {Annals VII. 366), 

 is in Patula (sub-gen. of Helix), while Lea's species is in Macro- 

 cyclis. II. clausa Say and divesta Gould are in Triodopsis, of 

 which palliata Say is the type, but they have no teeth, and 

 must have been misunderstood ; they seem to belong rather to 

 Mesodon. 



II. obstricta is considered a var. of palliata, albolaoris of 

 exoleta, and Roemeri of ' dentifera / in the opinion of American 

 Conchologists all are distinct species. 



II. Ingallsiana Shuttl. (Mesodon), misspelt in the list quoted 

 Jugattsiana, was so named in compliment to Dr. T. It. Ingalls 

 of Greenwich, IST. Y., but not described by Shuttl eworth, who 



