194 A MANUAL OF AMERICAN LAND SHELLS. 



is very short, bluutly rounded, aud bears a short, bluut cutting point. 

 The first marginals (Fig. Z) are but a modification of these laterals, by 

 the greater development of the reflection and shortening of the inner 

 cusp. The outer marginals (Fig. c) become wide, low, irregular in 

 shape; the upper edge broadly reflected, the reflection reaching the 

 lower edge of the base of attachment, and bearing along its whole 

 length numerous (G or 8 in some teeth) short, subequal denticles, some 

 bluntly rounded, others longer and sharp, giving a pectinate api)ear- 

 ance. 



Fcrussacia subcyliiidrica, Linn. 



Shell small, thin, transparent, oblong-oval; epidermis smoky horn- 

 FiG. 202. color, smooth, very bright and shining; whorls 5 or 6, 

 somewhat rounded, the last equalling two-fifths the shell's 

 length, rounded at base; apex obtuse; suture somewhat 

 impressed; aperture lateral, oval, its plane nearly parallle 

 with the axis of the shell; peristome simple, thickened, 

 often slightly rufous; umbilicus imperforate; columella ob- 



F. suhcylindrica, 



enlarged, golctely truncatcd at base. Length, 6^"'; diameter, 2^'"'"; 

 aperture, 2^™"" long, ^'""' wide. 



Helix subcylindrica, LiNN., Syst., ed. 12, ii, 1248 (1767).— Not MONT. 



Helix hibrica, Mullkr, Verm. Hist., i, 104 (1774). 



Bulimua luhrictis, Draparnaud, Moll., 75, pi. iv, 24,— Gould, luvertebrata, 193, fig. 



124 (1841).— Adams, Sheila of Verniout, 157 (1842).— Dk ICay, N. Y. Moll., 55, 



pi. iii, fig. 43 (1843).— BiNNEY, Terr. Moll., ii, 283, pl.lii, fig. 4. 

 Jchatina lubrica, Pfeiffer, Mou. Hel. Viv., ii, 272.— W. G. Binney, Terr. Moll., iv, 



138. 

 Zm lubrica, Leach, Moll., 114.— Gray, Man., 188.— Keeve, Brit. L. & Fr.-W. Sh., 



93 (1863). 

 Cionella lubrica, Jeffreys, Linn. Trans., xvi, 327. 

 Zua subcylindrica, Tryon, Am. Journ. Couch., iii, 299 (1868). 

 Cionella subvyrmdrica,W. G. Binney, L. & Fr.-W. Sh.,i, 224 (1869).- Gould and 



Binney, Iuv., 431, fig. 690 (1870). 

 Fei-unsacia lubrica, Pfr., Mon., vi, 245 (1868). 

 Bulimus lubricoidei, Stimpson, Sh. of N. E., 54. 



Bulimus subcylindricus, Moquin-Tandon, Moll. Fr., ii, 304, pi. xxii, figs. 15-19. 

 Zua luhicoidea, Morse, Journ. Portl. Soc., i, 30, figs. 79, 81, 84; pi. x, fig. 82 (1864); 



Amer. Nat., i, 607, fig. 49 (1868). 

 Ftrussacia subcylindrica, W. G. Binney, Terr. Moll.,v, 187. 

 Cionella (Zua) Morseana, Doherty, Quart. Jouru. Conch., i, 342, lA. iv, fig. 2 (1878). 



From Canada to the Eed Eiver of the North and English Eiver ; in 

 Nebraska ; in New England and the States bordering the great lakes. 

 Thus it belongs to the Northern Eegion of the Eastern Province, as 

 far south as mountains of North Carolina. In the Central Province it 

 has been found in Colorado, and at Fort Wingate, in New Mexico ; in 

 the Pacific Province in California, Washington Territory, and in Alaska. 



