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 Pliil. 

 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 Avhich 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 strlse, and 

 the peritreme attached at its upper part. (t. 7. 

 f. 75.) 



Cyclostoma elegans. Di-ap. p. 32. t. 1. f. 5. 8.; Brard, p. 103. 

 t. 3. f. 7. 8.;^ Linn. Trans, xvi. f. 63. ; Tiirtoiu Man. ed. 1. 

 93, f. 75. ; Leach, Sijn. Moll. 203. ; Forbes and Hanley, B. 31., 

 iv. 201. t. 122. f. 3.— Cyclostoma (Ericia) elegans. Moq. 

 Tand., Moll. Franc, ii. 496. t. 37. f. 2. 23. — Junior Cycl. 

 Sapiitus. Maduyt, Moll. Vien. 79. — Cyclostomus elegans. 

 De Jlfontfort, 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. — Nerita elegans. MUller, Vei-m. ii. 177.— 

 Var. Smaller, and nearly Smooth. — Cyclostoma marmorea. 

 Brown, Edinh. Journ. Nat. and Geog. Sci., 13. t. 1. f. 10. 11. 



In hedges and under stones, in chalk and lime- 

 c 2 



