HELIX. 



131 



or reddish horu- colored, thickened, expanded, and roundly Fit;. 221. 

 reflected, with two teeth on the margin of the callus, the lower 

 one lamelliform, the other small, often obsolete, the colu- 

 mellar margin partially covering the middling-sized, pervious 

 umbilicus. Greater diam. 13J, lesser 11 ; heigbt 7 mill. 



Helix mullani, Bland & Coopek, Ann. N. Y. Lye. VII, 363, 



pi. iv. f. 16, 17 (1861). 

 Triodopsis mullani, Tryon, Am. Journ. Conch. Ill, 52, pi, 



ix, f. 15 (1867). 



Dead specimens found near Cceur d'Alene Mission, Coeur 

 d'Alene Mountains ; living ones on the west side of tlie Bitter 

 Root Mountains, Washington Territory; St. Joseph's River, 1st 

 Camp, Oregon. Under logs and in dry pine woods. 



Fig. 222. 



Helix fallax, Sat. — Shell umbilicated, depressed-globose, with rib- 

 like striae, reddisli horn-colored ; spire convex ; whirls six, rather convex, 

 the last deflected anteriorly, constricted ; aperture tri- 

 lobed, contracted by a large, oblique, tongue-shaped, 

 arcuately-entering tooth on the parietal wall ; peristome 

 reflected, thickened within, white, with two teeth, the 

 upper one bending inward not on the edge, the other 

 subbasal. Greater diam. 13, lesser 11 ; height 7^ mill. 



Helix fallax, Say, Journ. Phila. Acad. V, 119 (1825) ; 



BiNNEY's ed. 27.— DeKay, N. Y. Moll. 28, pi. iii, f. 



23 (1843).— Pfeiffek, Mon. Hel. Viv. I, 412; in 



Chemnitz, ed. 2, I, 364, pi. Ixiv, f. 7-9. — Reeve, 



Con. Icon. no. 686 (1S52). 

 Helix tridentata, Bixney, part, Bost. Journ. Nat. Hist. 



Ill, 382, pi. xviii, f. 3 (1840) ; Terr. Moll. II, 183, pi. xxviii,_W. 



G. Binjjey, Terr. Moll. IV, 72. 

 Triodopsis fallax, Tkyon, Am. Journ. Conch. Ill, 51, pi. ix, f. 12 



(1867). 



From Canada to Texas and Florida. 



Nearly allied to H. tridentata, but in this, the spire is more 

 elevated, and sometimes has six full volutions. There is a deep 

 groove behind the peristome, contracting the aperture ; the peri- 

 stome is widely I'cflected, and directed inwards, forming a basin- 

 shaped mouth ; the upper tooth on the peristome is broader, 



Helix fallax. 



