Helicid^e. 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 small 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, lxxvi. 166. : 

 Montagu, p. 549. t. 11. f. 10.; Linn. Trails, viii. 

 201. 



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



Helix aculeata. Miiller, Verm. ii. 81.; Dinp. 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 much 

 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 

 h3 



