CYCLOSTOMID^E. 275 



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 circumference 

 of the aperture or mouth. 



111. 1. CYCLOSTOMA elegans. Elegant Circle Shell. 



(t. 7. f. 75.) Shell conic-oval, with raised spiral 



striae, and the peri treme attached at its upper part. 

 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. 

 Cyclostomus elegans. De 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. 



tumidus. Penn. 



Nerita elegans. Muller, Verm. ii. 177. 



Var. Smaller. 



Cyclostoma marmoratum. Brown ? 



In hedges and under stones, in chalk and limestone 

 districts ; England and Wales, /3 Scotland, Edinburgh ? ? 



Animal grey-brown. 



Shell half an inch long, and four tenths of an inch 

 wide, solid, grey or purplish-yellow, mostly purple 

 at the tip, often marked with two rows of purplish 

 brown spots ; spire composed of five rounded volu- 

 tions, marked with numerous close-set raised spiral 

 striae and finer longitudinal ones between them; 

 aperture round with a small angle at top, and an um- 

 bilicus behind the pillar ; operculum hard, horny ex- 

 ternally, arid marked with a single depressed spiral 

 N 6 



