JURASSIC PERIOD. 



457 



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

 lu8. Fig. 714, Mystriosaurus (Teleosaurus) Tiedmanni, of the Crocodilian order. 



Fig. 715. 





\ 



Reptile.— Plesiosaurus macrocephalus (X A). 



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



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, Sagenojrteris, Glos- 

 f>oj)terin ; of Cycads, Pterophyllum, Zamites, Palecozamia, 

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

 Dammarites. There are also species of Equisetum. Fig. 671, 

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

 megalopliylla, from the "dirt-bed." 



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

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

 the Oxford Oolite. 



Coprolite. 



