94 
HELICID^. 
Var., shell pale horn-colour ; animal rather darker (^Alder^ 
Cat. Mag. Zool. and Bot. ii. 108.) : Helix nitidosa. Fer. 
Tab. Moll. 214. (not synonyma) ; Rossm. Jun.i.ll.t. 1. f. 23. 
Inliab. under stones, decayed leaves, &c., in woods. 
Animal white, with two black lines ; mantle white> 
speckled with black. 
Shell varying from one fifth to one sixth of an 
inch in diameter, somewhat like Z, crystallina^ but 
larger, more convex, and less shining, the whorls less 
closely set, and the outer one larger in proportion to 
the rest : the umbilicus is also larger. 
Mr. Jeffreys considers it as a variety of H, nitidula; 
but Mr. Alder justly observes that it differs from 
that species in being scarcely one third the size, of a 
different colour, and without any trace of opacity 
underneath. This species preserves its characters 
unchanged even when living in the midst of its 
allies. 
28 . 4. ZoNiTES nitidulus. Dull Snail. — Shell nearly 
flat, deep yellowish horn-colour, sub-pellucid, 
rather strongly wrinkled, of a dull waxy appear- 
ance above, more shining below, except near 
the umbilicus, around which it is of an opaque 
white ; whorls 4^ ; umbilicus large, exposing 
the second whorl, (t. 12. f. 136.) 
Oxychilus nitidulus. Fitz. Syst. 100. — Polita nitidula. Held. 
Isis, 1837, 216. — Helicella nitidula. Beck, Ind. 6. — Zonites 
nitidulus. Gray, Man. 172. t. 12. f. 136. ; Forbes and Han- 
ley, B. M. iv. 36. t. 120. f. 9, 10. — Z. (Aplostoma) nitidulus. 
Moq. Tand. Moll. Franc, ii. 83. t. 9. f. 12, 13. — Helix niti- 
dula. Drap. 117. t. 8. f. 21, 22.; Gray, Med. Repos. 1821, 
239.; Shepp. Linn. Trans, xiv. 160.; Alder, Cat. 134. 49.; 
Mag. Zool. and Bot. ii. 147.; Jeffreys, Linn. Trans, xiii. 340. 
Var. 1. Helmii, t, 12. f. 136., transparent - greenish white 
