128 A MANUAL OF AMERICAN LAND SHELLS. 



Arioiita Towiisendiaiia, Lea. 



Shell umbilicated, depressed-globose ; epidermis yellowish and browu- 

 Fig. 100. ish horn color, more or less intermixed 5 sutnre 



distinct; whorls 5 J. with minute, imi)ressed, lon- 

 gitudinal strife, which can scarcely be traced by 

 the eye, and coarse, oblique wrinkles and strisej 

 body-whorl large, voluminous, rough, and corru- 

 A. Townsendiana. gated ', apcrture rather large, somewhat rounded ; 

 peristome white, fully reflected at the base and but partially so to- 

 wards its superior part, thickened and a little projecting internally in 

 the base of the aperture ; umbilicus open, deep, a little contracted by 

 the reflection of the peristome ; h-r.^e convex and turgid. Greater di- 

 ameter 29, lesser 24™'". ; height, 10""". 



Helix Toicnsendiana, Lea, Trans. Am. P'lil. Soc, vi, 99, pi. xxiii, fig.^0 (1840); Obs., 

 ii, 99 (1^39) ; in Troschel's 'Arch. f. Nat., 1839, ii, 221.— Binney, Bost. 

 Journ. Nat. Hist., iii, 371, pi. xiii ; Terr. Moll., ii, 161, pi. xix. — De Kay, N. 

 y. Moll., 46 (1843).— Pfeiffer, Mon. Hel. Viv., i, 341 ; in Chemnitz, ed. 2, i, 

 323, pi. Ivii, figs. 10, 11 (1846).— Reeve, Con. Icon.,62,''i (1852).— Gould, U. 

 S. Expl. Exp. Moll., 66, fig. 36 (1852).— W. G. Binney, Terr. Moll., iv, 15; L. 

 & Fr.-W. Sh., i, 164 (1869).— Bland, Ann. N. Y. Lye, vii, 362. 



Mcsodon Toumsendiana, Tryon, Am. Journ. Conch., iii, 46, pi. viii, fig. 8, var. tig. 6. 



Helix pcdestris, Gould formerly. See Otia, 243. 



Helix riiida, Gould formerly. ^ 



Helix ptychophora, A. D. Brown, Journ. de Conch., 3d series, x, 392, Oct., 1870. 



Jrionta Totvnsendiana, W. G. BinneY, Terr. Moll., v, 355. 



A species of the Oregonian Eegion ; it also passes the Cascade Mount- 

 ains into the Interior Province, and along the mountains extends 

 southeasterly into Idaho and Montana. 1 doubt its existence in Cali- 

 fornia at Crescent City, as stated in Terr. Moll., V. 



Animal corpulent, gradually tapering ; color pale yellowish-green ; 

 surface with rather sparse, feebly developed, elliptical granules, not 

 seeming to have any re^;ular arrangement; margiu of disk rather 

 broad, granulated, but re ,ularly marked with radiating furrows. 



A small variety found in Northern Idaho is more 

 strongl;y and coarsely wrinkled. This is here figured 

 ;Fig. 101), as well as a smaller, thinner, smoother 

 variety, from Salmon Eiver, Idaho, and Bitter Eoot 

 A. Towsendiaiw^av. Mouutaius aud Valley, called i)tyclio;pliora (Fig. 102). 



