349 



Helix pifcinalis. GmeJ. Syfl. p. 3627. 44. 



Turt. Lin. iv. p. 512. 

 Helix pufiUa. Gmcl. Syfl. p. 5627. 45. 



Turt. Lin. 4. p. 513. 

 Turbo thermal is. Gmel. Syjl. p. 3603. 61 ? 



Turt. Lin. iv. p. 493 ? 

 Troc'.ius crirtatus. Schroeter FluJ^conch. p. 2S0, t. 6. f. 11. 

 Neiita pifcinalis. Muller Verm. ii. p. 172. No. 35S 



Schroeter FluJfcoticL p. 247. No. 61. 

 Nerita pufilla. Muller Verm. ii. p. 171. No. 357. 



Schroeter Flujjconch. p. 246. No. 59. 



T. with a thin, fiib-pellucid, horn-coloured fhell, with 

 four or five much rounded, very prominent, fmooth, or 

 finely wrinkled volutions ; the laft fmall, and rather com- 

 preffed, giving the (hell an obtufe apex : aperture per- 

 feftly orbicular ; lips thin ; inner lip (lightly attached to 

 the body whirl : bafe perforated with a fmall, but deep 

 umbilicus. Length and breadth nearly the fame, rarely 

 exceeding a quarter of an inch. 



This fpecies is not uncommon in fome of our rivers 

 and fmall fi;reams ; fomeiimes in ftagnant waters, and 

 particularly in drains or water-courfes, in lov/ fwampy 

 ground. 



We have found it in various parts of Wilf/Iiire, efpeci- 



ally in the Avon, and in the moat round the old caWe 



at Marlborough: in Devonjfiire not far from Exeter; 



and in Dorfetpiirc in Perbeck very plentiful. In the 



river Kennet about Newbury, it is not uncommon. 



Iv 



