THE PERMIAN PERIOD. 



2O I 



Bristol will be considered as Triassic, thus leaving Protoro- 

 saurus * as the principal and most important representative of 



Fig. 138 Protorosantiis Speneri, Middle Permian, Thuringia, reduced in size. 

 (After Von Meyer.) [Copied from Dana.] 



the Permian Reptiles.t The type-species of the genus Pro- 

 torosaurus\'$,\\\zP. Speneri (fig. 138) of the "Kupfer-schiefer" of 



* Though commonly spelt as above, it is probable that the name of this 

 Lizard was really intended to have been Proterosaurus from the Greek 

 proteros, first ; and saura, lizard : and this spelling is followed by many 

 writers. 



t In an extremely able paper upon the subject (Quart. Journ. Geol. 

 Soc., vol. xxvi.), Mr Etheridge has shown that there are good physical 

 grounds for regarding the dolomitic conglomerate of Bristol as of Triassic 

 age, and as probably corresponding in time with the Muschelkalk of the 

 Continent. 



