HELIX. 



93 



Helix Iftindsi, Pfeiffer, — Shell narrowly umbilicated, depressed, 

 delicately striate, brownish horn-color, diaphanous, thin, shining ; spire 

 slightly elevated ; whirls five, flattened, the last deflected at the aperture, 

 more convex and constricted below ; iimbilicus pervious ; aperture very 

 oblique, lunate, ringent; peristome slightly reflected, its termi- 

 nations converging, joined by a triangular, tooth-like, two- Fig. 167. 

 forked callus, the right hand margin with one sub-vertical 

 lamina, the colnmellar margin with two acute denticles. 

 Greater diam. 8, lesser 7 ; height 4i mill. 



Helix hindsi, Pfeiffek, in Proc. Zool. Soc. 1845, 132; Mon. 



Hel. Viv. I, 416 ; in Chemnitz, 2d ed. I, 373, tab. Ixv, f. 



7, 8.— Reeve, Con. Icon. 712 (1852).— Gould, in Terr. 



Moll. Ill, 17.— W. G. BiNNEY, Ter. Moll. IV, 92, pi. Ixxviii, f. 5, 6, 8. 

 DcEclalochila hindsi, Tkyon, Am. Journ. Conch. Ill, 63, pi. x, f. 24, 44 (1867). 



Texas and Mexico. 



Fig. 1G8. 



Helix 

 texasiana. 



Helix texasiana, Moricand. — Shell rimately perforated, depressed, 

 orbicular, rather solid, of a pale liorn-color, sometimes with a revolving 

 rufous band, with crowded rib-striae above, smooth, or faintly striated, and 

 shining beneath ; spire nearly flat, of five whirls separated by a well- 

 marked suture, the outer one obtusely angular at periphery, nearly at the 

 plane of the spire, and somewhat deflected near the aperture ; 

 beneath couvexly rounded, with a somewhat distorted appear- 

 ance in consequence of the whirl becoming narrower, rather 

 than broader, towards the aperture, leaving a minute umbilical 

 perforation ; aperture very oblique, narrow lunate, the peri- 

 stome forming about two-thirds of a circle, reflected, white, 

 with a constriction behind it, and aimed with two denticles at 

 its inner margin, one near the centre, the other at the middle of the basal 

 portion ; the extremities of the peristome connected bj* a callus across the 

 columella, of an acutely angular form, pointing to the middle of the 

 portion of the peristome above the upper denticle, the lower ramus of the 

 angle being longest and largest, and a little concave inwardly. Greater 

 diam. 10, lesser 8^ ; height 5 mill. 



Helix texasiana, Moricakd, Mem. Soc. Phys. Hist. Nat. de Geneve, VI, 

 538, pi. i, f. 2 (1833).— Desiiayes in Lamarck, VIII, 133; ed. 

 3, III, 316 ; in Fer. I, 74, pi. 1, c (excl. syn.\ — Ferussac, Hist, des 

 Moll. pi. Ixix, D, f. 2.— Pfeiffkr, Mon. Hel. Viv. I, 418, excl. syn. 

 and var. 6; vol. IV, 318.— Ciiemmtz, ed. 2 (1846), I, 85, escl. var. 



