PLATE XV. 

 Jurassic Dinosaurs. — Sauropoda. 



ATLANTOSAURID.E. 



Page. 



Fig. 1. Back of skull of Atlantoaaurus montanus Marsh 166 



Fig. 2. The same specimen ; inferior view 166 



bp, basioccipital process ; «', pituitary canal ; /, foramen magnum ; h, pos- 

 terior fossa; i, internal carotid foramen; oc, occipital coudyle; p, par- 

 occipital process; pr, parietal; s, suture; so, supraoccipital. 

 Both figures are one-half natural size. 

 274 





