HELIX. 117 



Planorbis obvolutus. Poir. Prod. 89. — Helix obvoluta. Milller 

 Verm. 27. ; Lindsay., Trans. Linn. Soc. 765. ; Forbes and 

 Hnnley, B. M. iv. 63. t. 117. f. 1,2, 3, — Helix bllabiata. Oliv. 

 Ad. 177. — Helix trigonophora. Lam. Journ. N. H. t. 42. f. 2. 

 — Helix holosericea. Gmel. (not Studer; Drop. Moll. t. 7. f. 

 27. 29. ; Brnrd, Moll. 62. t. 2. f. 16, 17. ; Rossm. Leon. 69. t. 

 1. f. 21.; Ferus. Hist. t. 51. f. 4. — Helix (Helicodonta) obvo- 

 luta. Ferns. Prod, n, 107., Hist. t. 51. f. 4. — Helicodonta 

 obvoluta. Risso, Fur. Merid. iv. 65. — Trigonostonia obvo- 

 lutum. Fitz.Syst.9S. — Gonostoma obvolutum. Held. Isis, 

 1837, 915.— Vortex obvoluta. Beck, Lnd. 29. 



Inhab. shady woods, among the moss near the roots 

 of trees, in Ditcham Wood, near Buriton, Hants. 

 (^Dr. James Lindsay.^ Probably introduced, but is 

 now naturalised. 



Animal shagreened, foot grey, neck blackish ; ten- 

 tacles black, upper long, lower very short. (^Sturm, 

 t. 17.) Jaw moderate, striated in front, crenulated 

 on the edge; epiphragm rather solid, flat, snow- 

 white. 



The shells in " living specimens are thickly covered 

 with very fine hairs, which are so extremely brittle 

 as to render it a matter of great difficulty to get the 

 animal out without rubbing them offl" 



e. Shell orbicular, depressed, perforated, equally con- 

 vex on both sides, sharply carinated in its outer 

 circumference ; aperture transverse, oval ; the 

 peristome united all round, elevated from the other 

 ichorls, and margined; epiphragm membrana- 

 ceous. (Chilotrema Leach. Rock Snail.) 



41. 8. Helix lapicida. Variegated Rock Snail. — 

 Shell umbilicate, finely granulate, grey or pale 

 rufous with reddish rays or spots, (t. 5. f. 51.) 



I 3 



