HELIX. 117 



Planorbis obvolutus. Poir. Prod. 89. Helix obvoluta. Mutter. 

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

 Hanley, B. M. iv. 63. t. 117. f. 1, 2, 3. Helix bilabiata. 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. ; Brard, Moll 62. t. 2. f. 16, 17.; Rossm. Icon. 69. t. 

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

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

 obvoluta. Risso, Eur. Merid. iv. 65. Trigonostoma obvo- 

 lutum. Fitz. Syst. 98. Gonostoma obvolutum. Held. Isis, 

 1837, 915. Vortex obvoluta. Beck, Ind. 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 off." 



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 

 whorls, 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 



