CRAG OF NORFOLK A^D SUFFOLK. 



357 



FIG. 255. Trophon elegans, dorsal side, from the red crag. 



laminated clay and loam, with layers of flinty shingle repos- 

 ing on chalk, and generally covered with a thick bed of 

 gravel: this stratum contains about a hundred species of 



^^^g^ - S ^ B ^^- 



FIG 256. Natica glaucinoides, Cor. crag. Fia. 257. Astarte plana, Cor. crag. 



