﻿KIMMERIDGE CLAY. 



69 



shallow channels. The long diameter of the shaft, four inches beyond the least produced 

 part of the base, is 3^ inches, being nearly the same as in Omosaurus. The edge of the 

 spine is along the same line as the most produced part of the base. The shaft has a 

 central cavity, as in Omosaurus. Should these prove to be a pair of carpal spines they 

 indicate a species of Dinosaur distinct from Omosaurus armatus. 



§ 18. Life and Affinities of Dinosauria as elucidated by the known character 

 of Omosaurus. — In the ' Isis von Oken,' Band xxiii, Heft v, 1830, 4to, p. 518, 

 Hermann von Meyer proposed the following distribution of Fossil Saurians according 

 to the structure of their hind-limbs : — 



" Saurier mit ZeJien, loelche denen der lebenden am ersten noch entsprechen 



wiirden, vnd zicar 



"a. VlERZEHIGE. 



" Rhacheosaurus, H. v. Meyer. 

 " Geosaurus, C/tvier (?). 

 " Teleosaurus, Geoff roy (?). 

 " Aeolodon, H. v. Meyer. 

 " Streptospondylus, 

 " Metriorhynchus, 

 " Macrospondylus, 

 " Lepidosaurus, 

 " Mastodonsaurus, Jaeger (?). 



*H. v. Meyer (?). 



" b. FUNFZEHIGE. 



" Protorosaurus, H. v. Meyer. 



" Saurier mit jlossenartigen Gliedmassen. 



" Ichthyosaurus, Conybeare. 

 " Plesiosaurus, Conybeare. 

 " Mosasaurus, Conybeare. 

 " Phytosaurus, Jaeger (?). 

 " Saurocephalus, Harlan (?). 



