HELIX. SNAIL-SHELL. 49 



11. Helix fontanz. Fountain Snail-shell. 

 Montqgu, pi. G. f. 6 Dorset Cat. pi. 1<). f. 19. 



Shell very flat, horn-color, transparent, smooth, a little 

 concave in. the centre on both sides, but more deeply and 

 .distinctly so on one side : spires four, a little concave in the 

 centre on both sides, but more distinctly soon one ; the outer 

 volution with a faint ridge-like appearance, formed by the 

 gradual slope of the primary volution on each side : aperture 

 contracted, half oval, a little pointed at the top, oblique, the 

 edges very thin and taking in half the body volution at their 

 point of contact : diameter hardly two tenths of an inch. 



In fresh waters : not common, v. v. 



12. Helix Ericctorum. Heath Snail-shell. 



Lister, pi. 78. f. 78 Pennant, pi. 88. f. 5 Montagu, 

 pL24. f, 2 Donovan, pi. 151. f. 2 Dorset Cat. pi. 20. f. 8. 



Shell svmitransparent, a little convex on one side, with 

 a large and deep perforation on the other: spires six or 

 seven, well deimed, the primary one large and finely 

 rounded, striate across : color whitish or grey, often pale 

 ftffous, with mostly a brown band on the upper part of the 1 

 larger volution which continues round the edge of the 

 smaller ones, and frequently several small girdles at the 

 base; sometimes it is vaiiegated with brown, the bands 

 -often lighter and more transparent, and sometimes they are 

 hardly discernible : the tip or termination of the spires 

 dark polished brown : aperture somewhat orbicular, slight- 

 ly crescent-shaped, attached half way down the body volu- 

 tion : diameter nearly an inch. 



Dry sunny banks, arid warm walls, v. v. 



13. Helix cingenda. Banded Snail-shell. 



Lister, pi. ?8. f. 79 Montagu, pi. 24. f. 4 Pennant, 

 pi. 88. f. 2 Linn. Trans.viii. pi. 5. f. 6 Dorset Cat. pi. 18. 

 f. 5. 



Shell Sjemitransparent, rather convex, reddish or yel- 

 lowish-white, with numerous narrow spiral zones of a ches- 

 nut or chocolate-brown color placed at irregular distances, 

 btit generally divided into sets of three or four each by 

 broader whitish bands, and often interrupted so as t6 form 

 short streaks, especially towards the top, where they be- 



