HELIX. 



133 



Fig. 224. 



Udlx hopLUititnsis. 



striae, olive horn-color ; spire obtuse, convex ; whirls five and a half, rather 

 convex, the last scarcely deflected in front, constricted at the aperture ; 

 aperture lunar, tridentate ; a moder- 

 ate, tongue-shaped, slightly entering 

 parietal denticle ; peristome reflected, 

 within thickened witli a white, light 

 callu:-, its right margin with a small, 

 somewhat anterior denticle, its basal 

 terminus with a marginal denticle. 

 Greater diam. 13, lesser 11 ; height 6 mill. 



Hdix hopetonensis, Shuttleworth, Bern. Mitt. 1852, 198. — Reeve, Con. 

 Icon. no. 709 (1S52).— Pfeiffek, Mon. He). Viv. Ill, 263 ; in Chem- 

 srrz, ed. II, 420, pi. exlviii, f. 17, IS (pi. Ixiv, f. 7-9 ?).— Godld, 

 Terr. Moll. Ill, 17.— W. G. Bikney, Terr. Moll. IV, 72, pi. Ixxvii, 

 f. 16. 



Helix tridentafa, var., Bikney in Bost. Journ. Nat. Hist. Ill, 382, pl. sviii, 

 f. 2. — Feecssac, Hist. pl. li, f. 3, small fig. on the left. 



Helix tridentatu, var. epliahus, Say, of Ravekel's Cat. 9 (1834), nodescr. 



Triodopsis hopetonensis, Tevon, Am. Journ. Conch. Ill, 52, pl. ix, f. 9 

 (1867). 



Georgia and Florida. 



It differs from H. fallax in its smaller, scarcely pervious um- 

 bilicus, its deeper color, lighter peristome, and denticles being 

 more widely separated. 



Helix VUltuosa, Gocld. — Shell umbilicated, orbicular, depressed, 

 about equally convex on both sides, rather solid, dark horn-color, deli- 

 cately striated; spire a low dome, composed of about five and 

 a half whirls, which are moderately convex, and separated by 

 a well-defined suture, the exterior one somewhat angular at 

 periphery ; beneath, well rounded, and perforated by a deep 

 umbilicus, about one-fourth as broad as the base; aperture 

 rather large, lunate ; peristome moderately reflexed, tortuous, 

 white, having at the base a small tooth, and at the centre a 

 deeply-seated, more expanded, reflexed tooth ; tlie parietal wall 

 bears a stout, elevated, arcuated, oblique lamella, joined to the 

 lower extremity of the peristome only ; on the base of the shell 

 is a transverse internal tubercle. Greater diam. 10, lesser 9; height 5;! mill. 



