142 
HELICID^. 
f. 2.; Moquin Tandon^ ii. 107. t. 10. f. 9 — 12. — Zomtes 
radiatus. Leach^ MolL Syn. 74. — Helix perspectiva. Me- 
gerl^ Berh Mag, — Discus rotund atus, Fitz. Syst, 99. — 
Patula rotundata. Held, Isis^ 1837. 916. — Euryompbala 
rotundata. Beck, hid, 9. 
Var. b., spire quite flattened : Helix Turtoni. Fleming, Brit, 
Anim, 269. — Helix albella. Linn, S. Nat. — Helix rotun- 
data. Turton, Diet. p. 53. 
Var. c., white, transparent, and without rays : Zonites rotun- 
datus. Gray, Man. 165. t. 5. f. 44. 
Common under stones and wood^ on dead trees, 
and in crevices of old walls. 
Animal pale grey, dotted above ; foot short, hya- 
line ; back, head, and tentacles blackish (^Sturm); 
jaw slender, striated, and crenulated ; teeth are those 
of a true Helix. 
Shell about a quarter of an inch in diameter, 
nearly equally convex on both sides, slightly carinate, 
strongly and regularly striate across, yellowish or 
reddish-grey with chestnut rays from the centre; 
aperture semilunar, as wide as long, thin and not 
reflected ; umbilicus large and deep. 
This species varies in size and in form, especially 
of the spire, which is sometimes rather convex, and 
at others nearly flat : in the latter form, it has been 
considered as a separate species ; and Nilson believes 
that the shell which Linngeus described Helix albella 
in his Swedish Fauna,” is only a young species of the 
flat-spired variety of this shell. It also varies in the 
intensity of the brown spots on the spire ; sometimes 
they are diffused and at others entirely wanting, and 
the shell is sometimes nearly transparent and colour- 
less. 
The jaw of Helix pygmea {^Moq. Tand. t. 10. f. 2.), 
