198 



NATURAL SCIENCE 



[September 



his, not that of Mr Barrois, who only says " un assez grand nombre 

 d'especes cenomaniennes " (a considerable number of Cenomanian 

 species). I do not understand how Mr Dollfus arrives at the 70 

 unless he brought the fossils of the Sarthe into account. This, I 

 contend, should not be done ; those only should be marked which 

 occur above the Gaize in the east of France ; i.e. those recorded by 

 Mr Barrois in his " Terrain Cretace des Ardennes," in the beds which 

 lie between the Gaize and the Turonian. I have done this and find 

 that only 48 raDge upward. The numbers 51 and 48 are so near 

 that it is clear the Gaize de l'Argonne will not decide the question. 



We come next to the Upper Gault of Wissant, as to which 

 Mr Dollfus says that d'Orbigny was wrong in referring it to the 

 Albian. I cannot find that any French geologist has published a list 

 of the fauna of the Upper Gault at Wissant. Mr Barrois tells me 

 that he does not know of any such list, and in classing the upper 

 part of the Wissant clay as Cenomanian, he seems to have relied on 

 the proofs of its correspondence with the Gaize de l'Argonne, and on 

 the greater extension or overlap of the zone of A. injlatus. 



A list of the Wissant fauna has, however, been published in Eng- 

 land by Mr F. G. H. Price, who sent the fossil-collector, J. Griffiths 

 of Folkestone, over to Wissant for the express purpose of collecting 

 separately from the Lower and Upper Gault of that place. The 

 results were embodied in a small treatise on the Gault published by 

 him in 1879, but the Wissant lists have never been printed separ- 

 ately. In this connection it will be useful to give a list of the 

 fossils found by Griffiths in the Upper Gault of Wissant, indicating 

 at the same time how many occur also in the Lower Gault of that 

 place and how many range up into the beds above. 



