Oh. XVII.] FOSSILS OF UPPER CRETACEOUS ROCKS. 



327 



Among the brachropoda in the white chalk, the Terebratulce are 

 very abundant. These shells are known to live at the bottom of the 

 sea, where the water is tranquil and of some depth (see figs. 298, 

 299, 300, 301, 302). With these are associated some forms of oyster 



Fig. 29S. 



Fig. 



Fig. 300. 



Fig. 301. 



Terebratulina striata. Bhynchonella Magas pumila, Sow. Terebratula 



Upper white chalk. octopUeata. Upper white chalk. carnea. 



(Var. of T. plicatilis.) Upper white chalk. 

 Upper white chalk. 



•(see figs. 309, 310, 311), and other bivalves (figs. 303, 304, 305 f 

 306, 307). 



Fig. 803. 



Fig. 304. 



Terebratula biplicata, 

 cow. Upper cretaceous. 





Crania Parisiensis, 

 inferior or attached 



valve. 

 Upper white chalk. 



Pecten JSeaveri, reduced to 

 one-third diameter. 



Lower white chalk and chalk 

 marl. Maidstone. 



Fig. 305. 



Fig. 306. 



Fig. 307. 



Pecten 5-costatus. 



White chalk, Upper and 



Lower Greensands. 



Plagiostoma IToperi, Sow. 



Syn. Lima Hoperi. 



White chalk and Upper Grcensand. 



Lima spinosa, Sow. 



Syn. Spondylus spinosus. 



Upper white chalk. 



Among the bivalve mollusca, no form marks the Cretaceous era in 

 Europe, America, and India, in a more striking manner than the 

 extinct genus Inoceramus (Catillus of Lam. ; see fig. 308), the shells 

 of which are distinguished by a fibrous texture, and are often met 

 with in fragments, having, probably, been extremely friable. 



Of the singular family called Budistes, by Lamarck, hereafter to 

 be mentioned as extremely characteristic of the chalk of Southern 



