HELIX 



145 



Fig. 247. 



From Western New York and Pennsylvania to Missouri ; from 

 Georgia to Illinois. Also In the postplelocene of 

 the Mississippi Valley 



Jaw narrow, slightly arcuate, somewhat attenu- 

 ated towards the ends ; anterior surface ribbed ; 

 both margins denticulated. 



The lingual membrane, as figured by Leldy (Terr. 

 Moll. II, 200), is similar to that of H. albolabris. 



Helix Wlieatleyi, Bland. — Shell imperforate, depressed, conoid- 

 globose, thin, reddish horn-colored, with numerous rib-like stri», and 

 microscopic granulations with very short hairs ; spire shortly 

 conoid ; suture deeply impressed ; whirls five and a half, 

 rather convex, the last rounded, slightly depressed at the 

 aperture, constricted ; base convex, excavated in the um- 

 bilical region ; aperture oblique, lunate, with a small parietal 

 tooth-like tubercle ; peristome acute, rose-colored, equally 

 angularly reflected, appressei at the columella. Greater 

 diam. 14, lesser 12 ; height 7 mill. 



Helix ivhcalleiji, Bland, Ann. N. Y. Lye. VII, 118, pi. iv, f. 



19 (1860). 

 Mesodon wheatleiji, Teton, Am. Journ. Couch. Ill, 40, pi. 



vii, f. 10 (1867). 



Mountains in Cherokee County, North Carolina. 



Helix dentifera, Binxky. — Shell imperforate, flattened-convex on 

 the upper surface, convex below ; epidermis yellow- 

 ish horn-color, immaculate ; spire depressed ; whirls ^^E- 249. 

 five, with delicate, parallel, oblique strire ; suture 

 distinct, not deeply impressed ; aperture contracted 

 by the peristome, flattened towards the plane of the 

 base ; peristome thickened, white, broadly and ab- 

 ruptly reflected ; parietal wall with a prominent, 

 white, tooth-like process nearly parallel with the 

 lower margin of the aperture, not projecting towards 

 the umbilicus ; base convex. Greater diam. 23, lesser 

 18 ; height 10 mill. 



Helix dentifera, Binnet, Bost. .lonrn. Nat. Hist. I, 



494, pi. xxi (1840); Terr. Moll. II, 134, pi. Edix dent, rem. 



10 Sept., 1868. 



