16 INTRODUCTION. 



latter, for the young of this species, probably mis- 

 led by Draparnaud, who had called it a Physa. 

 How Draparnaud could have done so, I do not 

 know, for it is a dextral shell (as is also the speci- 

 men figured by Turton, f. 104.), who referred it to 

 Lymneus. 



23. Diastropha contorta. 



Physa contorta Michaud, Bull. Lin. Soc. Bord. iii. 



368. t. f. 15, 16., Comp. t. 16. f. 21, 22. 

 Physa alba Turton, Zool. Journ. ii.361., Man. ed. 1. 



f. 111. 

 Physa rivularis Philippi, 146. t. 9. f. 1. 

 Inhab. Sicily, Corsica, Algiers, and the Pyrenees. 

 Introduced into the Fauna by Dr. Turton, on 

 the same authority as Bulimus pupa, with about as 

 much probability. Dr. Fleming does not think it 

 distinguishable from Ph. fontinalis ; probably he 

 had not seen a specimen. 



24. Physa acuta Drap. 55. t. 3. f. 10, 11., Brard, 



Conch. 169. t. 7. f. 5, 6. 



Inhab. France, Italy, and Sicily. 



This shell is introduced on the authority of Mr. 

 James D. C. Sowerby, who believes it was found in 

 Wales. Lamarck refers to Lister, Ang. t. 2. f. 25., 

 for this species. 



25. Planorbis lutescens Lam. Hist. vi. 153. 



Inhab. France. 



Introduced by Mr. Jeffreys, who thought his 

 P. disciformis was this species. 



26. Cyclostoma ferrugineum Lam., Rossm. t. 28. f. 



396., Potiez, Gal. 1. 236. t. 24. f. 7, 8. 

 Cyclost. productum Turton, Man. ed. 1. 94. f. 76. 

 Turbo fulvus Wood, Cat. Supp. t. 6. f. 9. 



