HELIX. 
141 
pyramidal, with very numerous regular longitudinal 
lamellae not shooting in the middle into spinous pro- 
jections ; spire composed of six rounded and deeply 
divided volutions, which very gradually decrease from 
the tumid and rounded base ; the tip obtuse and 
usually of a whitish colour ; aperture narrow crescent- 
shaped, wider than long, the margin thin and reflected 
over the umbilicus, which is small and deep. 
Like that of H. aculeata, the periostracum of this 
species rises into thin laminar foliations, which in 
various positions of light reflect a velvety or satin- 
like lustre ; but the foliations are infinitely more 
numerous and compact, not shooting into spinous 
processes in the middle ; the shape of the spire is 
also very different, not decreasing in a conical 
manner, but regularly pyramidal ; and the aperture, 
instead of projecting forward in a semielllptic form, 
is narrow crescent-shaped, without the internal rib 
round the margin. 
i. Shell depressed^ more or less heeled^ hr own or varied^ 
striated ; whorl closely applied ; peristome simple ^ 
slightly depressed ; jaws slender y striated and 
crenulated. (Delomphalus Ferns.) 
59. 26. Helix rotundata. Radiated Snail. — Shell 
flattish, slightly carinate, deeply striate, rufous- 
grey with chestnut spots, (t. 5. f. 44.) 
Helix (Delomphalus) rotundata. Charpent^ 1837. — Helix ra- 
diata. Da Costa^ p. 57. t. 4. f. 15, 16. ; Montagu^ p. 431. 
t.24. f. 3.; Turton, Man ed. 1. 59. f. 44. — Helix rotundata. 
Muller, 29.; Drap, p. 114. t. 8. f. 5—7.; Brard, p. 51. t. 2. 
f. 10, 11. ; Jeffreys, L, T. xiii. 342. ; Eossm. Icon. vii. f.454.; 
Forbes and Hanley, B. M. iv. 80. t. 119. f. 6, 7. t. G G G. 
