M6 



FOSSILS OF UPPER CEETACEOUS ROCKS. [Ch. XYll 



Fj£c. 262. 



a. Fragment of Turrilites costatus. 

 Chsdk mai-l. 



Turrilites costahis. 

 Chalk. 



0. Same, showing the indented border 

 of the partition of the chambersv 



Among the bracliiopoda in the white chalk, the Terehratulce are verj 

 abundapt. These shells are known to live at the bottom of the sea, where 



Fig. 264 



Fig. 26 



Terehratnla DefranelL 

 Upper white chalk. 



Terebratula 

 octopUcata, 

 (Var. of T. plicatlUs.) 

 Upper white ehalk. 



Fig. 267. 



Terebratula pumdlm. Terehratida 

 {3Iagas puoniius, Sow.) carnea. 



Upper wMte chalk. Upper white chalks 



the water is tranquil and of some depth (see figs. 264, 265, 266, 267, 

 268). With these are associated some forms of oyster (see figs. 275, 

 276, 277), and other bivalves (figs. 269, 270, 271, 272, 273). 



Ffg. 263. 



Fig. 



Fig. 270. 



Terebratula biplieata, 

 &9W. Upper cretaceous. 



Crania Parisiensis, 

 inferior or attached 



valve. 

 Upper wliite chalk. 



Pecten Beaveri, reduced to 



one-third diameter. 

 Lower white ehalk and chalk 

 marl. Maidstone. 



Among the bivalve mollusca, no form marks the cretaceous era iii 

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

 extinct genus Inoceramus (Catillus of Lam.; see fig. 274), the shells 



