256 Mr.Dela Becheonl^ie Geographical Distribution of Organic 



which accompany it in the latter locality, may have had great 

 influence on the animal life of the vicinity. 



M. Dufrenoy mentions that in the oolite beds of Mauriac, 

 the upper contain many polypifers, and appeared to him ana- 

 logous with the calcaire a polypiers of Caen (cornbrash and 

 forest marble). He enumerates the following fossils in these 

 beds : 



Pecten obscurus. 



• fihros lis. 



Terebratula subrotunda. 



perovalis. 



tetraedra. 



concinna. 



Plagiostoma punctatum? 

 ovale. 



Modiola cuneata ? 



Unio crassissimus. 



Melania striata ? 



Ammonites annulatus. 



Patella. 



Echinites {very small). 



Encrinites. 



Madrepores. 



At Maisons Blanches, RufFec, and Negres near Couhe, 

 M. Dufrenoy remarks, " In the first of these localities the rock 

 contains an abundance of smooth Terebratiilae ; and strikingly 

 resembles the limestone observed between Oxford and Blen- 

 heim, referred to the cornbrash." The fossils are : 



Pecten obscurus. 

 — — — laminatus. 

 ■ barbatus. 



Plagiostoma punctatum. 

 Terebratula perovalis. 



Terebratula bullata, 



ornithocephala. 



Ammonites elegans. 

 amiulatus. 



Rostellaria. 



Of the 26 species mentioned in the Yorkshire cornbrash, 

 3 occur in France, one {Ostrea Marshii) being the same with 

 one of the 3 of the great oolite : of these, 1 is found in the 

 forest marble of Calvados ; 1 in the forest marble and corn- 

 brash of the North of France; and 2 in the Mauriac beds. 

 South of France. Of the two Echinites of the Yorkshire 

 cornbrash, I is found in the forest marble of Calvados. 



Of the 32 species of fossil shells enumerated in the forest 

 marble of Calvados, 7 are found in the other localities : of 

 these, 3 occur in the great oolite, and 1 in the cornbrash of 

 Yorkshire ; 3 in the white marls or Bradford clay of the North 

 of France; and 1 in the Mauriac beds. South of France. Of 

 these 32 species, 7 are noticed in the lists of Mr. Conybeare 

 and Mr. Sowerby; 2 in the forest marble, 5 in the cornbrash, 

 and 5 in the Bradford clay. 



Of the 6 species noticed in the forest marble and corn- 

 brash of the North of France, 3 are found in the lists of Mr. 

 Conybeare and Mr. Sowerby : of these, 3 occur in the corn- 

 brash, 1 in the forest marble, and 1 in the great oolite; Of 

 the same 3 species, 1 occurs in the great oolite, and 1 in the 

 cornbrash of Yorkshire ; 1 in the forest marble of Calvados ; 

 and 2 in the Mauriac beds, South of France. 



