STRATIGRAPHICAL DISTRIBUTION. 117 



For collecting the last-mentioned species, the following localities may be named. 

 Norwich, S waff ham, Gravesend, Northfleet, Cambridge, Brighton, Lewes, Folkstone, &c. 



France is infinitely richer than Great Britain in Cretaceous Brachiopoda, and this will 

 be easily accounted for when we remember that the Etage Neocomien (of which our 

 Lower Green Sand only constitutes a small part) occupies a considerable portion of France, 

 where it acquires vast thickness and importance, contains there likewise the maximum of 

 Cretaceous species, and in it are found all those beautiful forms which materially help 

 to make up the eighty-nine species or varieties which have been figured and described 

 by M. d'Orbignyin the fourth volume of the 'Paleontologie Francaise, Terrain Cretacees;' 

 but it is much to be regretted that the distinguished author had not been better acquainted 

 with some of our British types, as a few of them have therein either received new names 

 or been misunderstood. We possess, however, several forms which have not been as yet 

 recorded in French catalogues, such as Lingula sub-ovalis, Thecidium Wetherellii, 

 Argiope megatrema, Trigonosemus incertum, Ter. capillata, T. Robertoni, T. depressa, 

 T. Carteri, and Bit. lineolata. 



The following is the distribution of the French Cretaceous Brachiopoda according to 

 M. d'Orbigny : 



. r Inferieur ou Neocomien . . . .22 



I. Ltage j\cocoraien X 



L Supeneur ou Ungonien / 



II. Etage Aptien . . . . . • •"> 



HI. Etage Albien . . . . . . .11 



IV. Etage Cenomenien . . . . . . .Hi 



V. Etage Turonien ....... 7 



VI. Etage Senonien . . . . . • .23 



But as three are repeated, the total amount of Cretaceous species or varieties | 

 known to M. d'Orbisfnv would be about . . - ^ 



