62 A MANUAL OF AMERICAN LAND SHELLS. 



Helix Breiceri seems to me synonymous with arhoreus, but 

 the description and figure from " Land and Freshwater 

 Shells" is here repeated. 



Shell umbilicated, depressed, smooth, shining, surface un- 

 broken by the wrinkles of growth, very light horn-color, spire 

 H.i^cri. scarcely elevated; whorls 4, flattened, the last depressed, 

 shelving towards its base ; umbilicus moderate ; aperture transversely 

 lunar; peristome simple, acute. Greater diameter 5""™; height, 2^'^^™. 

 Near Lake Tahoe, California. 

 Fig. 14 is drawn from an authentic specimen. 



Z. arhoreus is said by Gwynn Jeffreys to be nearly allied to the Eu- 

 ropean Z. excavatus (Ann. Mag. N. H., 1872, 245). 



Zonites iiideiitatus, Say. 



Fig. 15. Shell subperforated, flattened, thin, pellucid; epidermis 

 highly polished, corneous; whorls rather more than 4, rap- 

 idly enlarging, with regular, subequidistant, radiating, im- 

 pressed lines, which on the body- whorl extend to the center 

 of the base, outer whorl exi)anding towards the aperture ; 

 z.indentaius. guturc wcll imprcsscd; aperture rather large, transverse; 

 peristome simple, acute, very thin, at its inferior extremity terminat- 

 ing at the center of the base of the shell; umbilicus none, but the um- 

 bilical region is indented. Greater diameter 5, lesser 4i™™ ; height 



1 ni m 



Helix indentata, Say, Journ. Acad., ii, 372 (1822); Binney's ed., 24. — Binney, Bost. 

 Journ. Nat. Hist., iii, 415, pi. xxii, tig. 'A (1840); Terr. Moll., ii, 242, pi. xxix, 

 fig. 2.— De Kay, N. Y. Moll., 31, pi. iii, fig. 26 (1843).— Gould, Invert., 181, 

 fig. 109 (1841).— Adams, Vt. Moll., 160 (1842).— Chemnitz, 2d ed., i, 21, pi. 

 xxxiv, figs. 12-15. — Pfeiffer, Mod. Hel. Viv.,i, 59. — Reeve, Cou. Icon., 730 

 (1852).— W. G. Binney, Terr. Moll., iv, 119.— Morse, Amer. Nat., i, 413, 

 fig. 28 (1867). 



Hyalina subrupicola, Dall., Bull. U. S. Geol. and Geogr. Surv. of Terr., vol. iii. No. 1, 

 p. 103, fig., April 5, 1879. 



Hyalina indentata, Morse, Journ. Portl. Soc, i, 12, fig. 21 ; pi. ii, fig. 11 ; pi. v, fig. 22 

 (1864).— Tryox, Amer. Journ. Conch., ii, 246, 411 (1866).— W. G. Binney, 

 L. & Fr.-W. Sh., i, 35, fig. 45 (1869).— Gould and Binxey, Invert, of Mass., 

 ed. 2, p. 398 (1870). 



Zonites indentatus, W. G. Binney, T. M. U. S., v, 116. 



Inhabits all of the Eastern Province, having been found from Canada 

 to Texas, and from Dakota to Florida. Also the Central Province, 

 having been found in Utah, and I doubt not its eventually being found 

 also over the Pacific Province, especially on the mountains. It is also 

 said to occur in St. Domingo and Porto Eico. 



