144 



LAND AND FRESH WATER SHELLS OF N. A. [PART L 



Helix chl'istyi, Blaxd. — Shell imperforate, depressed, rather soliil, 

 with miiuerous oblique rib-like striae, dark horn-colored ; spire short, 

 obtuse; whirls four aud a half, rather convex, the last descend- 

 Fig. 245. i„g at the aperture, slightly angular at the periphery, con- 

 stricted, above gibbous ; base convex, excavated in the middle; 

 aperture depressed, with a strong, oblique, lamelliform parietal 

 tooth ; peristome reflected, with a white callus within. Greater 

 diam. 10, lesser 8 ; height 4^ mill. 



Helix christyi, Bland, Ann. N. Y. Lye. VII, 117, pi. iv, f. 5, 6, 



(18(30). 

 Mesodon chnstyi, Tkyon, Am, Journ. Conch. Ill, 40, pi. vii, 

 f. 11, (1867). 



Mountains in Cherokee County, N. C. 



Cat. No. 



No. of Sp. 



Locality. 



From wliom received. 



Cherokee County, N. C. 



Remarks. 



Fig. 246. 



Helix exoleta. 



Helix exoleta, Binney. — Shell imperforate, convex, somewhat 

 ventricose ; epidermis of a uniform, yellowish-horn, or russet-colnr ; 

 whirls between five and six, with fine, parallel 

 striae crossing them obliquely ; body -whirl large 

 and ventricose ; suture well-marked and distinct ; 

 aperture rounded, contracted by the peristome, 

 the plane of the aperture making a considerable 

 angle with the plane of the base ; peristome 

 thickened, white, reflected, its basal portion snb- 

 dentate : parietal wall with a prominent, white, 

 oblique tooth ; umbilicus covered. Greater diam. 

 28, lesser 23 ; height 17 mill. 



Helix exoleta, Binney, Terr. Moll. II, 131, pi. x.— Leidy, T. M. U. S. 25(5, 

 pi. X, f. 1-3, anat.— DeKay, N. Y. Moll. 27, pi. ii, f- 6.— W. G. Bi.nnev, 

 Terr. Moll. IV. 54. 



Helix zaiefa, Binxey, Bost. Journ. Nat. Hist. I, 492, pi. xx.— Mrs. Gray, 

 Fig. Moll. An. pi. cxci, f. 9, from Bost. ,Ionrn., no descr.— Pfeiffer, 

 Mon. Hel. Viv. I, 316.— Deshayes in Fer. I, 139.— Reeve, Con. Icon. 

 no. 622 (1852). 



Helix albolnbris, var., Fercssac, pi. xlvi, a, f. 6. — Pfeiffer, Symb. II, 22« 

 (no descr.) ; in Chemnitz, ed. 2, I, 81, pi. x, f. 19, 20. 



Mesodon exoleta, Tryox Am. .Journ. Conch. Ill, 39, pi. vii, f. 8 (1867). 



