62 HELICIP.F. 



Brown, Illust. Conch. G. B. p. 50, pi. 17, f. 21, 23,34 

 (ericitorum). — Chemn. Conch. Cab. vol. ix. f. 1193.— 

 Ferus. Prodrom. Moll. No. 281.— Lam. (ed. Desh.) Anim. 

 s. Vert. vol. viii. p. 60. — C. Pfeif. Deutsch. Land and 

 Siisswas. Moll. pt. 1, p. 38, pi. 2, f. 23.— Rossmassl. Iconog. 

 Land und Siisswas. Moll. pt. 1, p. 67, f. 17 ; and pt. 8, 

 p. 33, f. 517. — Krynicki, Bull. Soc. Nat. Moscou, vol. ix. 

 p. 190. — Charpent. N. Deiiks. Schweiz. Ges. Nat. vol. i. 

 (1837), p. 12, pi. 1, f. 18. — Chemn. (ed. Kiist.) Conch. 

 Cab. Helix. No. 131, pi. 22, f.21 to 26.— L. Pfeif. Monog. 

 Helic. vol. i. p. 163. 

 Helix striata, Muller, Hist. Verm. pt. 2, p. 38 (teste Beck), dead. 

 „ albella, Penn. Brit. Zool. ed. 4, vol. iv. p. 132, pi. 85, f. 122. 

 „ erica, Da Costa, Brit. Conch, p. 53, pi. 4, f. 8. 

 „ nivea, Gmelin, Syst. Nat. p. 3639 (dead). 



„ cespitum, b. Drap. Moll. Terr, et Fluv. France, pi. 6, f. 16, 17. — C. 

 Pfeif. Deutsch. Land und Siisswas. Moll. pt. 2, p. 39, 

 pi. 2, f. 24, 25. 

 Oxychilus ericetorum, Fitzing. Syst. Verz. Erzh. Weichth. p. 100. 

 Hellicella „ Risso, Hist. Nat. l'Europe Mer. vol. iv. No. 155. 



Tlieba „ Beck, Index Moll. Mus. Christ. Frid. p. 13. 



XcropUla „ Held, Isis, 1837, p. 913. 



Helix dubia, Hartmaxn. 



Depressed, moderately firm, subopaque or semitrans- 

 parent, indistinctly striated above, wrinkled below, some- 

 what glossy, whitish or pale horn-coloured, with generally 

 a yellowish brown band winding along the base of the 

 smaller volutions, and running at some little distance from 

 the suture upon the body-whorl. This principal fillet is 

 sometimes obscure or entirely wanting, and in a rare 

 variety it is interrupted and dispersed over the upper side 

 of the whorls in transverse streaks ; generally also there 

 are from four to six narrower and less conspicuous spiral 

 bands below the primary one. Spire scarcely raised; 

 apex brown or horn-coloured ; whorls six, moderately 

 convex, gradually increasing, the last cylindrical and more 

 or less sloping downwards at its termination. Aperture 

 small, roundish, only exhibiting the external colouring, 

 not much interrupted by the penultimate volution, rather 



