HELIX. 43 



HELIX. LiNN^us. 



Shell spiral, opaque, or translucent, solid or thin, more 

 or less globose, in some discoid, smooth, or sculptured, 

 surface variously coloured, but seldom covered with a 

 polished epidermis. Mouth lunated, thickened within, 

 simple or toothed, peristome frequently reflexed. 



Animal moderately large in proportion to shell, head 

 with four developed tentacles, mantle not reflected on shell ; 

 tail lanceolate and never truncate ; foot often ample ; 

 tongue with the edge-teeth serrated. 



H. APERTA, Born. 



Subglobose, wrinkled lengthways, uniform brownish-green : 

 uiouth extremely large. 



Plate CXVI. fig. 7. 



Gault. pi. 1, f. 

 HdiK lerrestris, Forskael (teste Beck), Desc. Anini. It. Orient. 



„ aperta. Born, Mus. Caes. Vind. p. 387, pi. 19, f. 20.— Gray, Manual L. 



and F. W. Shells, p. 127, pi. H, f. 129.— Chemn. (ed. Kiist.) 



Conch. Cab. vol. vii. Helix, No. 1, pi. 1, f. 1 to 4. — L. Pfeif. 



Monog. Helic vol. i. p. 25. 



„ Neritoides, Chemn. Conch. Cab. vol. ix. pt. 2, p. 1.50, pi. 133, f. 1204, 



1205. 

 „ .\uticoides, Drapar. Moll. Terr, et Fluv. France, p. 92, pi. 5, f. 2C, 27. — 

 Ferus. Prodrom. Moll. No. 15; Hist. Moll. Terr, et Fluv. 

 pi. 11, f. 17 to 20. — Lam. (ed. Desh.) vol. viii. p. 35.— 

 Blainv. Man. Malacol. p. 460, pi. 40, f. 6. — Rossmassl. 

 Iconog. Land und Siissw. Moll. pt. 5, p. 1, f. 285 (pt. 2, 

 f. 156, animal). — Kuster, in Chemn. Conch, (ed. 2), p. 24. 

 Cantareus „ Risso, Hist. Nat. I'Europe Mer. vol. iv. p. 64. 



Canatoria „ Held, Isis, 1837, p. 910. 



Pomatia aperta. Beck, Index Moll. Mus. Christ. Frid. p. 44. 



Shell rather large, imperforate, globular, or ovate- 

 globose, inflated, very thin, not distinctly pellucid, with 



