149 



Varies in the intensity of the colour and in transpa- 

 rency, the specimens found in very damp situations 

 being generally much darker and more polished. 



Mr. Alder observes, that the smaU variety is not un- 

 common ; it is darker coloured, and with very delicate 

 and beautiful concentric striae on the base, only visi- 

 ble with a high magnifier, which induced him at first 

 to consider it distinct ; but on closer examination, he 

 found slight traces of these striae visible on the full- 

 grown and decided specimens of H.fulva; he has 

 therefore not ventured to separate it. (1. c. 108.) 



33.15. HELIX aculeata. Prickly Snail, (t. 4. f. 33.) 

 Shell conical, globose, brown horn-colour, with 

 the suture deep ; the periostraca rising into thin 

 spinous foliations ; aperture semielliptic. 



Helix spinulosa. Lightf., Phil. Trans. Ixxvi. 166. ; 



Montagu, p. 549. t. 1 1. f. 10. ; Linn. Trans, viii. 



201. 



Teba spinulosa. Leach, Moll. p. 1 00. 

 Helix aculeata. Mutter, Verm. ii. 81.; Drap. p. 



82. t. 7. f. 10, 11.; Alder, Cat. 109. 

 Helix delectabilis. Solander, MSS. 



Inhab. woods, under leaves and stones. 



Animal greenish ; tentacles long. 



Shell about the tenth of an inch wide, and as mucr 

 high, thin, semitransparent, brown horn-colour; the 

 volutions rounded and deeply separated, clothed with 

 a thin periostraca, which rises into numerous regular 

 rather oblique foliations shooting into points, exhibit- 

 ing the appearance of a circle of bristles round the 

 middle of each ; aperture somewhat orbicular, as long 

 H 3 



