ORDER Vlir 



DINOSAURIA 



233 



downwards and forwards, and meet in a cartilaginous symphysis. The femur 

 is considerably longer than the crus, and its large head is directed inward 

 from the shaft to enter the acetabulum. The astragalus is without an 

 ascending process. All the phalanges are short, and the ungual ones are 

 compressed, and were sheathed with horn, or hoof-like. 



Remains of Sauropoda occur principally in the Middle and Upper Jura of 

 England and Northern France, and in the equivalent formations of the Avestern 

 United States, especially Wyoming and Colorado. They are also known from 

 the Wealden and Lower Cretaceous of England, and from the Upper Mesozoic 

 of Madagascar, India, and Patagonia. 



Family 1. Oamarasauridae. Cope. (Atlantosauridae.) 



Teeth more or less compressed, and with anterior and posterior cutting edges. 

 Chevron hones articidated with-the solid caudal vertebrae. Jura and Wealden. 



Cetiosanrus, Owen (Cardiodon, Owen). A skeleton lacking the skull and 

 cervical vertebrae (0. oxoniensis, Phillips, from the Bathonian of Oxford, 



Fig. 334. 



Ornithopsis Tmlkei, Seeley. Wealden ; Isle of Wiglit. A, Anterior aspect. B, Lateral aspect. C, Cross- 

 section of dorsal vertebra, i/g. 5, Anterior face of centrum ; c, Posterior cup ; d, Transverse process ; /, Lateral 

 air-cavity ; hs-p, Hyposphene ; n, Neural canal ; o, Median septum ; p, Capitular facette for rib ; s, Neural spine ; 

 z, z'. Pre- and post-zygapophyses ; za, Hypantrum (after Hulke). 



England), indicates a total length of at least 12 m., and a height of about 

 3 m. Humerus and femur are of about equal length, the latter 1'7 m. long. 

 Ischia smaller than the pubes, and distally contracted. Middle Jura ; 

 England. 



Carnarasaurus, Cope {Atlantosaurus), Marsh. Fore-limbs longer than the 



