22 INTRODUCTION. 



10. Neritina virginea Lamarck, n. 18. 

 Nerita virginea Linn. s. n. 1254. 

 Neritina declivis Say, — Chemn. ix. t. 



124. f. h. i. 



Inhab. West Indies and N. America. 



Introduced by Dr. Turton, who says 

 he found several of this shell on the coast of Ireland. 

 Conch. Diet. 128. They most probably came from 

 some wreck. 



11. Truncatella subcylindrica. 



Helix subcylindrica Pulteney, Dorset, 49., Gmelin 



(?) Mont. T. B. 393. 

 Inhab. West Indies. 



Dr. Pultney introduced this shell as being m 

 found on water-plants in ponds and ditches in §j 

 Dorsetshire. Montagu justly doubts it, and ™ 

 says it is a common West Indian species. See 

 remarks on Truncatella truncata, by Lowe, Zool. 

 Journ. v. 280., and Deshayes, Lam. Hist. ed. 2. 265. 



12. Melania Matonii Gray, Miscellany, 1. 

 Murex fuscatus Maton and Racket, Linn. Titans, vii. 



150. t.4. f. 6. 



An African river shell. 



Introduced by Dr. Maton and Mr. Racket, and 

 said to have been found after a storm at Weymouth, 

 by Mr. Byers. 



Thus have I felt myself called on to exclude from 

 our Fauna no fewer than 50 species. 



In considering the geographical distribution of the 

 British land and fresh-water Mollusca, we must look 

 at them at least in two points of view ; first, as regards 

 their bearing on the general distribution of Mollusca 



