HELIX. 953 



Inhabits fresh water. Baster. 



Linnaeus has described this shell to be " hardly as large as a 

 barley-corn, of a pale horn-colour, ovate-oblong, and rather 

 acute ; umbilicus small and obsolete ; aperture ovate and 

 marginated." Pulteney considered MuUer's H. lubrica to 

 be this species ; but that shell is not at all perforated, nor 

 does it sufficiently correspond with Baster's figure, which 

 more resembles H. obscura. Linnaeus has described two 

 species with the name of H. stagnalis. 



OBSCURA. 149. Shell ovate-oblong, somewhat per- 

 forated, opake, with about six longitudinally 

 wrinkled whirls ; aperture roundish-lunated, 

 and the outer lip white. 



Helix obscura- Midler f^erm. ii. p. 103. Gmelin, p. 3661. 



Mojitagu Test. p. 391- t. 22. f. 5. Maton and Racket, 



in Lin. Trans, viii. p. 212. t. 5. f. 11. Dorset Cat. p. 



.55. t. 19. f. 27. 

 Turbo Rupium. Da Costa Brit. Conch, p. 90. 

 Bulimus hordaceus. Brnguiere Eiic. Meth. p. 334. 

 Le Grain d'Orge. Geqffroy, p. 51, No. 15. t. 2. 

 Lister Anim. Jng. t. 2. f. 8. Argenville, t. 28. f. 1 5. JPct- 



vanne, t. 65. f. F. 

 Junior. With the aperture unformed. 



Helix ventricosa. Muller Verm. ii. p. 102. Gmelin, p. 



3361. 

 Turbo pyramidalis. Gmelin, p. 3612. 

 Schroeter Erdconch. p. 141. t. 1. f. 8. 

 Inhabits the trunks of beech trees, ia Denmark. Muller. 

 France. Geoffroy. Saxony. Schroeter. Moist woods, &.c. 

 in England. Montagu. 

 Shell about three-eighths of an inch long, and rather more than 

 one third as broad, of a brownish horn-colour, with six or 

 seven whirls ,• it differs from //. suh-cylindrica in colour, 

 in being larger, more opake, and wrinkled or somewhat stri- 

 ated longitudinally ; the outer lip is white. 



LACKHAMENSis. 150. Shell ovate-obloug, somewhat 

 perforated, rather pellucid, with seven whirls; 

 aperture roundish-lunated, and the outer lip 

 slightly reflected. 



Helix Lackhamensis. Montagu Test. p. 394. 1. 11, f. 3. 

 Maton and Racket, in Lin. Trans, viii. p. 212. 



