CETIOSAUBXD.E. 



133 



plane of condyles and not excessively flattened, and no inner 

 trochanter ; astragalus not applied to tibia; metacarpals short; feet 

 plantigrade. 



All the members were probably mainly of quadrupedal habits. 



Family CETIOSAURIDJE. 



Cervical vertebrae narrow and elongate, with rim of posterior cup 

 oblique, inferior surface of middle dorsal vertebrae narrow and more 



Fig. 20. 



Morosaurus grandis, Marsh. — Tooth ; from the Upper Jurassic of 

 North America, f . 



or less rounded ; sacral vertebrae mostly solid, and only the posterior 

 ones bearing their own arch ; caudals without postzygapophyses, the 

 prezygapophyses forming indents on sides of neural spines ; chevrons 



Fig. 21. 



Morosaunis grandis. — Left side of pelvis. y, r . a, acetabulum ; //, ilium 

 is, ischium ; p,p', pubis. (From the ' Amcr. Journ.*) 



