782 STRATIGRAPHICAL GEOLOGY. — [Boox VI. 
bird. Thus it possessed biconcave vertebre, a well-ossified broad 
sternum, three fingers only in each toe, all ending in a claw, a long 
lizard-like tail, each vertebra oi which bore a pair of quill-feathers, 

Fic. 378.—Jurassic PTEROSAUR. 
Pterodactylus crassirostris (Goldf.) (Middle Oolite). 
the wigs had free claws, and the jaws carried true teeth ,as in the 
toothed birds found in the Cretaceous rocks of Kansas.’ 3 
The most highly organized animals of which the remains have 

Fic. 379.—Jurassio DEINOSAUR AND PTEROSAUR, 
a, Megalosaurus Bucklandi (Meyer), tooth (4); b, Megalosaurus, restoration of head, 
after Owen (4); ¢e, Rhamphorhynehus Bucklandi (Goldf.), restoration, after 
Phillips; d, Do. tooth (nat. size); e, Do. jaw (4). 
been discovered in the Jurassic system are small marsupials, Two 
horizons in Kvgland have furnished these interesting relies—the 
Stonesfield Slate and the Purbeck beds. The Stonesfield Slate has 
’ See Marsh, Amer. Journ. Sci. Novy. 1881, p. 337, 

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