124 



SPECIFIC NAMES OF CYRENA FLUMINALIS. 



CHAF. VIII. 



water species above enumerated: Buccinum undatum, Lit- 

 torina littorea, Nassa reticulata, Purpura lapillus, Tellina 

 solidula, Cardium edule, and fragments of some others. 

 Several of these I have myself collected entire, though in a 

 state of great decomposition, lying in the white sand called 

 6 sable aigre ' by the workmen. They are all littoral species 

 now proper to the contiguous coast of France. Their oc 

 currence in a fossil state associated with freshwater shells at 

 Menchecourt, had been noticed as long ago as 1836 by 



Fig. 17 



a Interior of left valve, from Gray's Thurrock, Essex. 



b Hinge of same- magnified. 



c Interior of right valve of a small specimen, from Shacklewell, London. 



d Outer surface of right valve, from Erith, Kent. 



Cyrena fluminalis Muller 



Euphratis Chemnitz 

 consobrina Gaillaud 

 trigonula 8. Wood . 

 gemmelarii Philippi 

 Duchastelii Nyst 



Corbicula fluminalis Morsch 



Dates of Specific Names. 

 . 1774 

 . 1782 

 . 1823 

 . 1834 

 . 1836 

 . 1838 

 1853 



MM. Ravin and Baillon, before M. Boucher de Perthes com 

 menced the researches which have since made the locality 

 so celebrated.* The numbers since collected preclude all 

 idea of their having been brought inland as eatable shells by 

 the fabricators of the flint hatchets found at the bottom 



* D'Archiac, Histoire des Progres, &c.,vol. ii. p. 154. 



