CONCHOLOGIA CEST.RICA. 



tooth. It is impossible to distinguish it from some 

 forms of H. bucculenta" The impossibility arises from 

 the fact that it is, really, one of those forms. 



M. dent if era. 



[B. & B.J 



M. dentifera, BINN. 



Helix dentifera, Binn., Bost. Jour. 



Nat. Hist., I., 1840. 

 Fig, 23, 



Shell depressed, spire sub-convex; 



base well rounded; whorls 5, fine stri- 

 ate; aperture wide; lip broadly reflect- 

 ed, and covering the umbilicus; parietal 

 tooth prominent; color yellow horn. 

 H. 10, W. 23, mill. 



Station, mountain forests, Pennsyl- 

 vania. 



**, 



M. palliata, SAY. 



Helix palliata, Say, Jour. Phil. Acad. F. S., II., 1821. 



. paiiiata. Shell depressed, brown, rough or hispid; 

 Pig, 24, whorls 5, flattened above, striate; aperture 

 three-lobed, contracted; lip reflected, white, 

 often edged with brown, with two inter- 

 marginal teeth ; pillar lip with a long, 

 white, curved, tooth, originating at the 

 umbilicus, which is covered. H. 9, W. 

 35, mill. 



Station, mountain forests. Western Pennsylvania. 



Sub-genus TRIODOPSIS, RAFINESQUE, 1819. 



Shell orbiculate-depressed, or sub-globose ; obliquely 

 striate ; whorls 5-7, the last sub-deflected ; urnbilicate, 

 or closed ; aperture sinuate, sub-triangular ; peristome 

 with a broad reflected margin ; sides of the aperture, 

 armed with strong teeth. 



