152 PNEUMONOBRANCHIATA. 



tied appearance when alive; the foot is short and 

 thick. 



Shell a quarter of an inch in diameter, and as much 

 high, pale horn-colour, frequently a little rufous about 

 the mouth, extremely thin and light, clothed with a 

 very fine down enlarged at the base, which, when 

 worn off, leaves the surface glossy and minutely gra- 

 nulate like shagreen ; aperture crescent-shaped, rather 

 wider than long, very thin, and reflected only at the 

 umbilicus, which is extremely small. The larger 

 volution is well rounded, without keel or band, and 

 the internal rib only visible in full-grown specimens. 



This is evidently not the H. hispida of the conti- 

 nental writers, nor the H. sericea of Muller or Dra- 

 parnaud. 



36.18. Helix revelata. Green Snail, (t. f. 133.) Shell 

 orbicular, subglobose, thin, finely wrinkled, um- 

 bilicated, diaphanous, shining pale green, with a 

 few scattered hairs ; whorls convex, last largest ; 

 peristome thin. 

 Helix revelata. Ferussac, Prod. 44. ; Michel, Compl. 



27. t. 15. f. 6, 7, 8. ; Desk. Lain. Hist. viii. 83. 

 Inhab. shady places, among nettles. (Guernsey.) 

 Animal blackish. 



Shell thin, nearly transparent, green ; the mouth 

 large, roundish lunate, very oblique ; the umbilicus 

 rather narrow, only showing the penultimate whorl ; 

 the peristome is thin, and very slightly reflexed. Most 

 like H.fasca but not so thin, and smooth, green, and 

 umbilicated. 



This interesting addition to our Fauna was dis- 

 covered by Mr. Edward Forbes, in abundance, near 

 Doyle's Monument, in Guernsey, whence he kindly 



