196 



Trof. 0. C. Marsh — Gigantic Cerafopsidce. 



The posterior trunk vertebras have also short, flat centra, but the 

 diapophyses have faces for both the head and tubercle of the ribs, 

 as in Crocodiles, a feature not before seen in Dinosaurs (Woodcut, 

 Figs. 5-6). 



Fig. 3. — Anterior dorsal vertebra of T. porosus (side view). 

 Fig. 4. — The same vertebra (front view). 



Fig. 5. — Posterior dorsal vertebra of same species (side view). 

 Fig. 6. — The same vertebra (front view). 



The Sacrum. — The sacrum was strengthened by union of several 

 vertebras, ten being coossified in one specimen of Triceratops (Woodcut, 



