184 



LAND AND FRESH-WATER SHELLS OF N. A. [PART T. 



Subgenus POLYMITA, Beck. 



Shell with the perforation open or closed, globose, shining ; 

 spire short ; whirls 4-5, the last large, deflexed at the aperture ; 

 columella dilated at the base ; aperture contracted, subvertical, 

 roundly lunate ; peristome simple, obtuse, labiate within, its 

 margins distant. 



Animal (of H. varians, see Terr. Moll. lY, pi. Ixxviii, f. 22) 

 stout, anteriorly blunt, with long eye-peduncles ; posteriorly 

 long, acutely terminating. 



Helix varians, Mexke. — Shell subimperforate, of medium size, 

 solid, conic-globose, delicately striate, but leaving the surface smooth and 

 shining ; the ground-color is variable, being white, dusky, greenish or 



reddish, and either plain or variously en- 

 Fig. 324. circled by dark bands ; the apex and the 

 peristome, especially the columellar por- 

 tion, is always rose red, and generally, 

 likewise, the throat ; the spire is elevated, 

 composed of about five and a half convex 

 whirls, the outermost broadly rounded at 

 HelUc varians. the periphery; the base is moderately 

 convex and perforated by a minute um- 

 bilicus, nearly covered by the expanded and flattened peristome ; aperture 

 small, approaching two-thirds of a circle ; peristome acute, thickened 

 within, a little everted, becoming more so towards its inner junction. 

 Greater diam. 19, lesser 17; axis 15 mill. 



Helix varians, Menke, teste Pfeiffer.— Pfeiffer, Mon. Hel. Viv. I, 238 ; 



in CuEMNirz, ed. 2, II, 221, pi. cix, f. 1-5.— W. G. Binxey, Terr. 



Moll. IV, 51, pi. ixxviii, f. 22. 

 Helix carnicolor, Pfeiffer, Symb. I, 37. — Deshayes in Fer. I, 205, pi. 



xxix. A, f. 14-17.— Reeve, Con. Icon. no. 283 (1852). 

 Helix pisana, Pfeiffer in Chemxitz, IX, P. 2, 139, I. cxxxii, f. 1186, 87. 



— Ferussac, Hist. I. c. ? — Not of Muller. 

 Helix submeris, Mighels, Bost. Proc. 1, 187 (1844). — Pfeiffer, Mon. Hel. 



Viv. Ill, 183. 

 Helix rhodocheila, Binney (formerly), Terr. Moll. I. 

 Hcmotrichus Itainastomus, Swaixson, Malac. 165, f. 19. ? 



