JURASSIC PERIOD. 



457 



deirus ; figs. 713 a, 713 b, view and section of vertebra. Fig. 715, P. macrocepha- 

 ius. Fig. 714, Mystrio8aurus (Teleosaurus) Tiedmanni, of the Crocodilian order. 



Fix. 715. 





\ 



Reptile. — Plesiosaurus macrocephalus (X 4^)- 



Other Lias genera of Crocodilians of the Teleosaur family were the Macrospon- 



dylus and Pelagosaurus, specimens of which are found in 



Wurtemberg. Fig. 716 is a coprolite of a Saurian. Fig. 716. 



2. Oolitic Epoch. 



1. Plants. — The following are some of the common 

 genera : of Ferns, Pecopteris, Tseniopteris, Sagenopteris, Glos- 

 aoptcris ; of Cycads, Pterophyllum, Zamites, Palseozamia, 

 Mantellia (or Cycadeoidea) ; of Conifers, Taxitea, Thuyites, 

 Dammaritea. There are also species of Eqxiisetum. Fig. 671, 

 Portland " dirt-bed," with stumps of trees; fig. 673, Mantellia 

 tnegalophylla, from the "dirt-bed." 



2. Protozoans. — Sponges. — Sponges are common, and 

 are of many species. Fig. 717, Scyphia reticulata, from 

 the Oxford Oolite. 



Coprolite. 



