170 CWfCLUSION. 



squamosa, Zamiites megaphyllus, Ctenis latifolia, Sphenozamites- 

 Belli, Podozamites stonesfieMensis, and Carpolithes diospyriformis^ 

 Some of the cones of Araucarites met with in the Stonesfield Slate 

 may also he peculiar types, but similar Araucarian cones occur in 

 Inferior Oolite rocks. 



The most striking conclusion forced upon us by a general survey 

 of the OoHtio floras is the similarity in the composition of the 

 vegetation during the Jurassic era throughout the greater part of 

 the world. We cannot, I believe, deduce any evidence from such 

 data as we possess in favour of the existence of well-defined, 

 botanical provinces during the Ehsetic, Jurassic, or Wealden 

 periods. 



