64 HELIX. SNAIL-SHELL. 



48. Helix octanfracta. Eight-spired Snail-shell 

 Pennant, pi. 89.^. 5, not sufficiently taper nor elongated. 



Montagu, pi. 11. f. 8 Dorset Cat. pi. 18. f. 11. 



Shell finely tapering to a point, semitransparent, covered 

 with a tenacious blackish skin, under which it is whitish 

 horn-color and polished : spires eight or nine, rather flat 

 but well denned, obscurely striate or wrinkled longitudi- 

 nally ; the larger volution with a few transverse ridges : 

 aperture narrow-oval, contracted to a point at top; the 

 outer-lip very thin ; inner-lip forming a ridge-like projec- 

 tion near the base, without the least trace of reflexion or 

 perforation : length five eighths of an inch; breadth barely 

 two eighths. 



Cornwall and Devonshire, in still waters : rare. v. m. 



49. Helix Lackhamensis. Wiltshire Snail-shell 

 Montagu, pi. 11. f. 3. 



Shell oval-oblong, semitransparent, dull rusty-brown, 

 varying to horn-color and grey : spires seven, nearly flat, 

 but well defined, the first three or four of which are tu- 

 mid, the rest suddenly tapering to an obtuse point, longitu- 

 dinally wrinkled : aperture whitish or with a purple tinge, 

 somewhat oval, margined and reflected; the inner-lip 

 turned back so as to form a linear cavity behind it : length 

 five eighths of an inch ; breadth a quarter. 



Lackham and Bow woods, Wiltshire : rare. v. m. 



50. Helix obscura. Dusky Snail-shell. 



Montagu, pi. 22. f. 5 Linn. Trans, viii. pi. 5. f. 1 1 

 Walker, f. 41 Dorset Cat. pi. 19. f. 27. 



Shell oval-oblong, rather obtuse, opake, brown horn-co- 

 lor : spires from five to seven, a little rounded and very well 

 defined, obliquely wrinkled : aperture nearly oval, with a 

 white polished reflected margin, forming a groove behind 

 the pillar: length half an inch; breadth about a third of 

 its length. 



Woods, and under stones, v. v. 



51. Helix lubrica. Varnished Snail-shell 



Pennant, pi. 85. f. 4 Da Costa, pi. 5. f. 18 Montagu. 

 pi. 22. f. 6 Linn. Trans, viii. pi. 5. f. 12 Dorset Cat. 

 pi. 21. f, 18. 



Shell 



