220 



tvhich lias been hinted by one or two of our conchologi- 

 cal friends. To this v/e fliall only obferve ; the animal is 

 eflentially different, not poffefTing any of that beautiful 

 membrane which the animal of C\prcEa Pcdicidus throws 

 over the whole of its fhell ; but is like a common aquatic 

 Liraax ; of a pale colour. 



17, 

 .f ONTiNALis. Bulla fontinalis, Lin. Syfi. p. 1 185, —Gmcl Syji. p. 3427. 18. 



Lijhr Co?!ch. t. 134. f. 34.— /i A?r^. t.2. f.25, 



Chcm..Co?:ch. ix. t. 103. f. 877. 878. 



Fiilt. Cat. Dorfet. p. AO—Gualt. t. 5. C. C. 



Schroet. FhiJj'concL t, 6. f. 11. 



Turt. Lin. iv. p. 352. 

 Planorbis Bulla. M///^r Verm. p. 167. No. 353. 

 Turbo adverfus. Da Cojla p. 96. t. v. f. 6. 6. 



Favan. t. 61, E. 9. 



B. with four or five reverfed volutions, of a gloffy, pel- 

 lucid, light horn-colour: the body whirl large, the others 

 very fniall, and not much produced: aperture oblong- 

 three-fourihs the lengrth of the ftiell. 



O 



Old fliells are fomewhat ftriated, or rather wrinkled 

 longitudinally, with two or three faint tranfverfe ridges 

 on tj-.e body whirl. Length hajf an inch; breadth a 



'O 



quarter. 



This fpecics is not uncontmon in flagnant pools, as well 

 as running waters, in many parts of the kingdom ; but is 

 in general, not above half the hze defcribed. 



It 



