PLATE XXI. 



Jurassic Dinosaurs. — Sauropoda. 



ATLANTOS A U RID^E . 



Page. 



Fig. 1. Posterior cervical vertebra of Brontosaurus excelsus Marsh : front view. 169 



Fig. 2. Dorsal vertebra of Brontosaurus excehus; side view 169 



Fig. 3. The same vertebra ; back view 169 



6, ball; c, cup; d, diapophysis ; /, foramen in centrum;/', lateral fora- 

 men ; n, neural canal ; p, parapoph ysis ; r, rib ; 8, neural spine ; z, anterior 

 zygapophysis; z' , posterior zygapophysis. 

 All the figures are one-twelfth natural size. 



