HELIX. 



165 



of tlie peristome ; base convex and turgid. Greater diam. 29, lesser 24; 

 height IG mill. 



Helix toicnsendlana, Lea, Trans. Am. Phil. See. VI, 99, pi. xxiii, f. 80 

 (1840) ; Obs. II, 99 (1839) ; in Tkoscuel's Arch. f. Nat. 1S39, II, 

 221.— BiN.NEY, Bost. Journ. Nat. Hist. Ill, 371, pi. xiii ; Terr. Moll. 

 II, 161, pi. xix.— DeKay, N, Y. Moll. 46 (1843).— Pfeiffer, Mon. 

 Hel. Viv. I, 341 ; in Chemnitz, ed. 2, I, 323, pi. Ivii, f. 10, 11 (1846)- 

 — Reeve, Con. Icon. 625 (1852).— Gould, U. S. Expl. Exp. Moll. 

 66, f. 36 (1852).— W. G. Bixxey, Terr. Moll. IV, 15.— Bland, Ann. 

 N. Y. Lye. VII, 362. • 



Mesodon lounsendiana, Tryon, Am. Journ. Conch. Ill, 46, pi. viii, f. 7 

 (1S67). 



Helix pedestris, Gould formerly, see Otia, 243. 



Helix ruida, Gould formerly. 



Washington Territory ; Crescent City, California ; Montana 

 ( Coojjer). 



A small variety (17 mill, diam.) is found, more strongly and 

 coarsely wrinkled. 



Helix tiidiciilata, BiNNEt. — Shell suhumhilieated, orbiculate- 

 convex ; epidermis olivaceous ; spire a depressed coue ; whirls between 

 five and six, slightly convex ; body-whirl 

 voluminous, expanding somewhat towards the Fig. 286. 



aperture ; aperture transverse, rather circular; 

 peristome whitish, tliin, expanded, slightly 

 reflected at the basal portion, at the columella 

 dilated, reflected, and almost closing the um- 

 bilicus ; base convex ; a well-defined, rather 

 wide, dark chestnut band, margined with a 

 light color above and below, revolves near the 

 centre of the body-whirl, and is more or less Helix tudiculata. 



visible above the suture on the two whirls 



preceding the last ; surface of the outer whirl covered with somewhat 

 regular impressions or indentations with ridges between, causing it to look 



