962 ' HELIX. 



Variety C. With tke spire curved. 

 Helix curvata. Gmelin, p. 3668. 

 Helix, No. 329. Schroeter Ehil. ii. p. 272. 

 MaisigU Danub. iv. p. 89- t. 31. f. 4. Schroeter Fluss. 

 p. 360. t. 10 B. f. 3. 



Inhabits the Danube. Marsigli. 



Shell about three inches and a quarter long, and an inch and a 

 half broad, with nine whirls, of which the body-whirl is 

 much larger than the others, and the aperture roundish-oval. 

 This species rests entirely on the authority of Marsigli, 

 whose figures have been copied by Schroeter ; and //. Da- 

 nubialis, which is described with seven whirls, may probably 

 be a younger shell, or of a more stunted growth ; and H. 

 curvata has every appearance of an accidentally distorted 

 variety. 



sTAGNALis. 168. Slicll imperforate, oblong, veiitvi- 

 cose, pellucid, with the spire produced and 

 subulate ; aperture ovate. 



Helix stagnalis. Linnccus Syst. Nat. p. 1249. Pennant 

 Zool iv. p. 138. t. 86. f. 136. Da Costa Brit. Conch. 

 p. 93. t. 5. f. 11. Born Mm. p. 391. t. 16. f. ]6. 

 Schroeter Fluss, p. 304. t. 7. f • 1 and 2, and Einl. ii. 

 p. 167. Chemnitz, ix. part 2.- p. l68. 1. 135. f. 1237 and 

 1238. Gmelin, p. 3657- Donovan, ii. t.51. f.2. Mon- 

 tagu Test, p. 367. 1. 16. f. 8. Maton and Racket, in 

 Lin. Trans, viii. p. 214. Dorset Cat. p. 55. t. 21. f. 1 1. 

 Brookes s Introd. p. 129- t. 8. f. 109. Burrozo's Ele- 

 ments, p. 171. t. 20. f. 5. 



Helix Corvus. Gmelin, p. 36G5. 



Buccinum stagnale. Muller Verm. ii. p. 132. 



Bulimus stagnalis. Bruguiere Fnc. B'leth. p. 303. 



Lymnaea stagnalis. Lamarck Syst.des Anim. p.91. 



Le grand Buccin. Geoffrot/, p. 72. No. 22. t. 2. 



Bonanni Rec. and Kirch. 3. f. 55. Lister Anim. jing. 

 t. 2. f.21, and Conch, t. 123. f.21. Gualter, t. 5. f. 1. 

 Argenville, t.27. No.C. f. 1. Klein Ost. t. 3. f. 69. 

 Seba, iii. t. 39- f. 52 and 53. Martitii Berl. Mag. iv. 

 t. 9. f. 33 and 36. Favanne, t. 61. f. F I6, and F 23. 

 Inhabits rivers, ditches, and pools ; common in most parts of 



Europe. 

 Shell often two inches long, and about half as broad, thin, 



brittle, and pellucid, of a whitish, dusky, or greyish colour, 



sometimes covered with a greenish epidermis ; it has six or 



seven whirls, of which the body-whirl is very large; and con- 



