362 Description of a new Species of Helix, 



white, erect, oblique, tongue-shaped parietal tooth ; peris- 

 tome thickened, angularly reflected, the upper margin ex- 

 panded, the columella margin dilated, covering the um- 

 bilical perforation. Diam ; maj. 17, min. 15 mill.; Alt. 

 8 mill. 



Habitat. At the base of sandstone cliffs, mouth of Laurel 

 River, Whitley Co., Kentucky. A. G. Wetherby. 



liemarhs. — This species belongs to the same group (Me- 

 sodon) as //. dentifera, Binn., and H. lioemeri, Pf., but is of 

 smaller size, somewhat more elevated, and readily distin- 

 guished from them by the sculpture and epidermis. It dif- 

 fers from H. divesta, Gould, in having a parietal tooth, and, 

 although in general appearance like a small form of H. aj)- 

 pressa, Say, is without the lamina on the basal margin of 

 the peristome. 



Five specimens were collected by Mr. Wetherby, to whom 

 I dedicate the species. I am under obligation to him for 

 examples of this and many others, some of them rare species. 



I am indebted to my friend W. G. Binuey for the follow- 

 ing paVticulars of the dentition of H, Wetherbyi. 



Jaw as usual in Mesodon, low, wide, arcuate, ends but little attenuated, 

 bluut, with about eighteen decided 'ribs, denticulating either margin. 

 Lingual membrane long and narrow; teeth as usual in the subgenus (see 

 L. and F. W. Shells N. A., I, tigs. 232, 242). Centrals with a long 

 bluntly-pointed middle cusp, and obsolete side cusps ; laterals like cen- 

 trals, but with no inner cusps. Marginals low, wide, quadrate, with 

 one very long, oblique, blunt, inner denticle, and one outer, short, blunt 

 denticle. 



Helix Eclvar«lsi, Bland (^Stenotrema). 

 This pretty species, hitherto solely known from Virginia, 

 where it was discovered in 1857, by Mr. W. H. Edwards, and 

 not found since, was collected by Mr. Wetherby, in Laurel 

 and Whitley counties, Kentucky. 



laeSix ]5f©l>Bliaiia, Lea {Mesodon). 

 Li "Remarks on North American Helicidffi" (Ann. Lye. 

 N. y., VI, 341, 1858), concurrii]g in a suggestion of Dr. 



