334 



THE GEOLOGIST. 



each other the basins, or the gulfs belonging to the basins, 

 which existed at that period, with relation to the species 

 which lived in each of them. 



ist Group. — Neocomien. 



The Neocomien has been observed hitherto, in the Pro- 

 vencal basin and Dauphine{\), formed by the Departments 

 of Gard, Bouches du Rhone, Var, Hautes et Basses Alpes, 

 Vaucluse, Drome, and Isere. It has also been observed in 

 the Basin of the Seine, or Parisian Basin, in the Departments 

 of Aube, Haute Marne, Yonne, and Meuse. It is also found 

 in many parts of the Jura, in the Department of Doubs, 

 near Neuch^tel in Switzerland, and in Savoy. I shall give 

 the list of the species found in each of these three geographical 

 divisions in succession. 



JJEOCOMIEN GROUP OF THE PROVEN9AL BASIN 

 AND DAUPHINE. 



Lower Beds. 



[. Angulicostatus, 



A. Diphyllus. 



A. Ixion. 



Asperrimus. 



Didayanus, 



Jeannofi, 



Astierianus. 



Difficilis. 



Juilleti. 



Calypso. 



Fascicularis. 



Leopoldinus. 



Carteroni, 



Grasianus, 



Lepidus. 



Cassida. 



Heliacus. 



Ligatus. 



Castellanensis. 



Helius. 



Macilentus. 



Clypeiformis. 



Honnoratianus, 



Morelianus. 



Compressissimus. 



Incertus. 



Neocomiensis. 



Cryptoceras. 



IncBqualicostatus. 



Ophiurus. 



Cultratus. 



Infundibulum. 



Pulcliellus. 



Dispar. 



Intermedins, 



Picturatus. 



(1) I have here given the hmits of these basins, but in future, I shall 



.only indicate them by the titles in italics. 



