North American Helices, 9 



37. Arionta Leach. 



Type. H. arbustoriira L. 

 Townsendiana Lea. 



52. PoLYMiTA Beck. 



Type. H. muscaram Lea. 



varians Menke. submeris Migh. 



is varians MenJce. 



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

 caduca Pfr. should not be in the same genus with fuliginosa^ 

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

 (sub-gen. of Hjalina), 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. H. sportella Gould^ 

 in my opinion, var. of Yancouverensis Lea {Annals YII. 366), 

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

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

 vrhioh jpalliata Say is the type, but they have no teeth, and 

 must have been misunderstood ; they seem to belong rather to 

 Mesodon. 



H. ohstricta is considered a var. of jpalliata^ albolahris of 

 exoleta, and Moemeri oi dentifera ; in the opinion of American 

 Conchologists all are distinct species. 



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

 Jugallsiana, was so named in compliment to Dr. T. R. Ingalls 

 of Greenwich, ^N". Y., but not described by Shuttleworth, who 

 several years ago called my attention to it. He sent me a plate 

 (executed under his direction), in which it is figured with H. 

 clausa, Mitchelliana, Pennsylvanica, and Columbiana. It 

 appears in form more like, but smaller, than Pennsylvanica, 

 having a somewhat similarly shaped aperture, without, how- 

 ever, the callosity on the lower margin of the lip ; the umbi- 

 licus partially open. I have seen no specimen agreeing with 

 the figures. 



