958 HELIX. 



or purplish transverse bands on the body-whirl, and one oh 

 each of the other whirls, but sometimes there is only one on 

 the body-whirl ; the outer lip in full grown shells is thick- 

 ened on its inner margin, especially towards the middle, 

 where there is some appearance of an elevated belt. Chem- 

 nitz has figured a young shell, and mistaken it for MuUer's 

 H. acuta, which, as Bruguiere observes, is the Turbo fas- 

 ciatus of Pennant. 



SUBSTRIATA. 160. Shell ovate-conical, perforated, 

 minutely wrinkled longitudinally, and white 

 without bands ; aperture ovate, and the lip 

 slightly reflected and marginated. 



Helix substriata. Gmelin, p. S667- 



Helix detrita. Pulteneys Dorset Cat, p. 49, and new edit, 

 p. 56. 1. 19. f. 26. Montagu Test. p. 384. t. 11. f. J. 

 Maton and Racket, in Lin. Trans, viii. p. 217. 

 Buccinum minutissime striatum candidum. Schroeter Fluss. 



p. 345. 1. 10 A. f. 6. 

 Lister Conch, t. 108. f. 1. Gualter, t. 5. f. SS. 



Inhabits the Rhone at Vienne. Lister, fresh water near 

 Weymouth. Pultenei/. 



Shell about eight lines long, and rather more than half as broad, 

 white without any coloured markings, and rather glossy : it 

 has six slightly convex whirls well defined by the suture ; 

 the breadth is proportionably greater, and the form more 

 conical than in either H. detrita or H. Guadaloupensis, 

 and the aperture is rather more effuse, but has the lip thick- 

 ened in the same manner. Bruguiere has quoted the above 

 figures of Lister and Gualter for H. detrita, but they are 

 both said to be fresh-water shells, and are similar to some 

 which I brought from the neighbourhood of Bantry or Kil- 

 larney, and which Mr. Montagu assured me were like those 

 which Mr. Bryer had sent him from the neighbourhood of 

 Weymouth. At the time when I found them 1 attended 

 very little to this branch of Natural History, and cannot re- 

 collect whether it was in or out of water. 



UNDATA. 161. Shell turreted-ovate, sub-imperforate, 

 ventricose, whitish, with somewhat undu- 

 lated dark chestnut stripes, and the aperture 

 ovate. 



Helix undata. Gmelin, p. 3667. 



Helix, No. 143. Schroeter EinL ii. p. 216. 



