454 



62. 

 Vortex, Helix Vortex. Lin. Syji. p 124:3.— Gmel. Syjl. p. 3620. 



C/iem. Conc/u ix. t. 127. f. 1127. 

 Schroeter Fluffconch. p. 21S. t.5. f.l6. 17. 

 Lijler Conch, t, 138. f. 43. 

 Id. Angl. t. 2. f. 2S. 

 Peiiv. Ga%. t. 92. f. 6. 

 Gualt. t. 4. G. G. 

 Br. Zool. t. 83. f. 124. 

 Pult. Cat. Dorfet. p. 47. 

 Turt. Lin iv. p. 508. 

 Don. Br. Shells, iii. t. 75. 

 Helix Planorbis. Z)iz Cojia. p. 65. t. 4. f. 12. 

 Pianorbis Vortex. Muller Verm. ii. p. 15S. No, 345. 



H. with a fub-pellucid, very depreffed, horn-coloured 

 fhell : volutions fix or feven, placed lateral ; the upper 

 fide concave; bafe or under fide flat, and even, the 

 whirls being only marked by a very fine line; the exte- 

 rior volution is fub-carinated, or brought to an edge at 

 the lower part: aperture comprefTcd, fiab-oval,angulated. 

 Diameter three-eighths of an inch, rarely half an inch. 



This is a very common fpecies in rivers, ponds, and 

 watery ditches, adhering to aquatic plants under water. 



It is readily diftinguiflied from any other Briiijli fliell 

 by the number of volutions, which exceeds any of the 

 deprefled Helices, and is much more flat in proportion, 

 to its fize, the H. Spirorhis excepted, with which it has 

 been confounded, its uPual colour is li^ht-horn, but is 

 fometimes rufous-brown; and often covered with a 



dufl^y. 



