3GS 



Helix ftagnalis. Br. ZooL t. 86. f. 136— Gualt. t. 5. I. L. 

 Da. Cojli.p.93. t. 5. f. 11. 

 FiiViW. t. 61. F. 16, &23. 

 Pult. Cat. Dorfet. p. 4S. 

 Don Br. Shells, ii. t. 51. f. 2. 

 Turt. Lin. 4. p. 536. 



H. with a thin, brittle, pelkicid, horn-coloured fiiell, 

 \vith fix or feven* fpires, the firft very large, the others 

 fmall and tapering to a very fine point ; body a little 

 wrinkled longitudinally, with a few faint, irregular, 

 tranfverfe ridges ; aperture oval, large, more than half 

 the length of the fhell ; outer lip thin ; pillar lip thick- 

 ened, fmooth. Length one inch and three quarters ; 

 breadth one inch. 



This fpecies which is the largeft of all our frefh-water 

 univalve fhells is not uncommon in many of our flow 

 rivers, and ftagnant waters. It is frequently covered 

 with a green epidermis, and fometimes a concreted 

 ftony matter, that almoft obliterates the upper voluti- 

 ons. Some authors have made this fliell into two or 

 three fpecies, apparently from fize only. 



Mr. Pennant has figured the H. palujlris as a vari- 

 ety, tab. 86. letter B. 



It is fubjeft to a gibbofity on the body whirl, which 

 in fome old fliells is large and very prominent. 



The 



