CYCLOSTOMA. 
19 
exotic species with ovate, few-whorled opercula. 
The foot of the species with orbicular, horny, many- 
whorled opercula is not so divided, but broad and 
expanded, like the foot of other terrestrial Mollusca. 
Dr. Turton, in his descriptions of this genus (ed. 
1. 93.), says the shell has no epidermis ; but this is a 
mistake : indeed, I am not aware of any shell that is 
really destitute of this important covering (see Phil, 
Trans, 1833), though it varies greatly in thickness in 
different genera, and in'this genus it is very thin ; but 
in some Indian species of the family it is thick, and 
forms a decided brown coat. In the same manner, 
he describes the operculum as horny. It is, as in 
most of the European species to which I am inclined 
to restrict the genus, decidedly shelly. 
The generic name is from the circular circum- 
ference of the aperture or mouth. 
1. 1. Cyclostoma elegans. Elegant Circle Shell. 
— Shell conic-oval, with raised spiral striae, and 
the peritreme attached at its upper part. (t. 7. 
f. 75.) 
Cyclostoma elegans. Drap. p. 32. t. 1. f. 5. 8. ; Brard^ p. 103. 
t. 3. f. 7. 8. ; Linn. Trans, xvi. f. 63. ; Turton, Man. ed. 1 . 
93, f. 75. ; Leach, Syn. Moll. 203. ; Forbes and Hanley, B. M., 
iv. 201 . t. 122. f. 3. — Cyclostoma (Ericia) elegans. Moq. 
Tand., Moll. Franc, ii. 496. t. 37. f. 2. 23. — Junior Cyci. 
Saputus. Maduyt, Moll. Vien. 79. — Cyclostomus elegans. 
Be Montfort, ii. p. 287. — - Turbo elegans. Mont. p. 342. t. 
22. f. 7. ; Linn. Trans, viii. 167. — Turbo striatus. Da 
Costa, p. 86. t. 5. f. 9. — Turbo tumidus. Penn. B. Zool. 
128. t. 82. f. 110. — I^erita elegans. Midler, Verm. ii. 177. — - 
Var. Smaller, and nearly Smooth. — Cyclostoma marmorea. 
Brown, Bdirih. Journ. Nat. and Geog. Sci., 13. t. 1. f. 10. 11. 
In hedges and under stones, in chalk and lime- 
