93 



XVI. CYCLOSTOMA. 



Shell oval or oblong, not clothed with an epidermis : 

 aperture circular or nearly so, without teeth ; the 

 peritreme united all round : operculum horny, 

 marked with a single depressed spiral line. 



This genus is distinguished from the Paludma in 

 having only a single spiral line on the lid ; from 

 the Valvata in wanting an epidermis ; and from 

 both in being a land shell, and never found im- 

 mersed in water. 



75. CYCLOSTOMA elegans. Shell conic-oval, with 

 raised spiral striae ; and the peritreme attached at 

 its upper part. 



Cyclostoma elegans. Drap. p. 32. t. l.f. 5 8. 



. . Brard,p. 103. t. 3./. 7, 8. 



Cyclostomus elegans. De Montfort, ii. p. 287. 

 Turbo elegans. Mont. p. 342. t. 22. f. 7. 

 Turbo striatus. Da Costa, p. 86. t. 5.f. 9. 



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

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



