MESOZOIC ERA. AGE OF REPTILES. ^331 



end. It is, therefore, characteristic of the Mesozoic. In 

 the Jurassic they were of extreme abundance, and of all 



FIG. 2W5. Jurassic plants- 

 Conifers : Cone of a pine. 



FIG. 268. Clypeus Plotii. 



FIG. 267. Apiocrinites restored. 

 (After Buckland.) 



FIG. 269. FIG. 270. FIG. 271. 



FIGS. 269-271. Jurassic lamellibranchs of England : 269. Trigonia clavellata. 

 270. Ostrea Sowerbyi. 271. Ostrea Marshii. 



