HELIX. SNAIL-SHELL. 59 
goes down to the bottom, nor willingly approaches any 
shore; for the shell is exceedingly brittle, and that of 
few fresh water snails is so thin: every shell contains about 
a tea-spoonful of liquor which is easily discharged upon 
being touched, and which is of the most beautiful red-pur¬ 
ple that can he conceived : it dies linen cloth, and it may 
perhaps be worth enquiry, as the shell is certainly found 
in the Mediterranean, whether it he not the Purpura of the 
ancients.” 
North of Ireland; Bantry bay; Le Hindi in the county 
of Clare; Fortrush; nearKenmare harbour in the county 
ofKerry; Dunmore; Waterford ; Barnstaple ; the warren 
between Dawlish and Exmouth ; and Oxwich bay, near 
Swansea, v. v. 
, 39. Helix vivipara. Oviparous Snail-shell. 
Lister, pi. 1055. f. 6 , and Anat. pi. 6 . f. 5— Pennant , 
pi. 87- f. 2, and pi. 88 . f. 1, the young— Da Costa , pi. 6. 
f. 2— Donovan, pi. 87— Dorset Cat. pi. 17. f. 2. 
The young, before and after exclusion. Lister, pi. 1054. 
f. 30. 
Shell thin, transparent, somewhat oval, tapering to a 
point, slightly striate longitudinally, and generally more 
strongly wrinkled near the lip : spires five or six, much 
rounded and separated by a deep line : color olive green, 
with three dark brown bands on the larger volution, and 
two on the rest, which grow fainter and become obliterated 
towards the point: aperture round-oval, contracted a little 
at the upper part, reflected at the pillar, with sometimes a 
small perforation behind it 5 outer lip thin, projecting and 
rounded in the middle $ inside smooth, greenish-white, 
landed like the outside : length nearly an inch and a half• 
breadth an inch. 
Still waters, and slow rivers, v. v. 
\ 40. Helix nemoralis. Girdled Snail-shell. 
Lister, pi. 5/. f. 54— Da Costa, pi. 5. f. 1 to 5; and 8 , 
11,19— Dorset Cat. pi. 21. f. 1 to 5 $ 8 , 14, and 19— Do - 
pi. 13. 
Shell somewhat globular, semitransparent, glossy, finely 
wrinkled, with five rounded volutions, ending rather ob¬ 
tusely: color and markings extremely various ; yellow, 
greenish. 
