HELIX. SNAIL-SHELL. 67 



Shell conic-oval, semitransparent, somewhat glossy, 

 slightly wrinkled longitudinally : spires six, whitish, with 

 sometimes a rufous spiral band round the middle of the 

 larger volution, which continues round the edge of the 

 other, but growing fainter and becoming indistinct in the 

 fourth volution ; sometimes there are three bands, the 

 middle one narrower, with one or two on the second volu- 

 tion, the rest being covered over with the band, except at 

 the junction ; and in some the bands are broken into lon- 

 gitudinal streaks ; but in British specimens all these mark- 

 ings are generally wanting : aperture oval ; the inner-lip 

 a little reflected over the pillar and forming a slight hollow 

 behind it : length three quarters ; breadth half an inch. 



Weymouth and Dublin, in fresh water : rare. v. v. 



57. Helix succinea. Amber Snail-shell, 

 Dorset Cat. pi. 18. f. 19, 



Helix putris. Montagu, pi. 16. f. 4 Donovan, pi. 168- 



Shell extremely thin and brittle, transparent, glossy, ob- 

 long, pointed, amber-color or reddish-yellow : spires three, 

 the first very large, oblong but not tumid, covering four 

 fifths of the shell, and the next much larger than the ter- 

 minal one which is rather obtuse : aperture wide oval, 

 reaching down two-thirds of the shell, the inner-1'p thick- 

 ened and rounded, but not reflected nor forming the least 

 perforation ; the outer-lip extremely thin, often membra? 

 naceous and elastic : length about half an inch, and a quar 

 ter wide. 



On aquatic plants, v v. 



58. Helix putris. Puddle Snail-shell. 



Lister, pi. 123. f. 23 Pennant, pi. 89. f. 3-~Qa Costa, 

 pi. 5, f. 13 Dorset Cat. pi. 21. f. 13. 



Helix peregra. Montagu, pi. 16. f. 3. 



Shell thin, semitransparennt, oval, rather obtuse, longi- 

 tudinally wrinkled, yellowish or hornrcqlor, often covered 

 with a '^dark-brown skin : spires four, rounded, the first 

 very large and tumid aperture very large, oval, reaching 

 down three-fourths of the shell j guter-lip thin; inner-lip 



thickened, 



