PLATE XII. 



Jurassic Dinosaurs. — Theropoda. 

 Dryptosaurid-ss. 



Pa<;e. 

 Fig. 1. Right premaxillary bone of Creosaurus atrox Marsh; one-sixth natural 



size 158 



a, front view ; b, lateral view, showing outer side ; c, lateral view, showing 

 inner surface. 

 FlG. 2. Left ilium of Creosaurus atrox; seen from the left; one-tenth natural 



size 161 



FlG. 3. The same ; seen from below ; one-tenth natural size 161 



a, anterior, or pubic, articulation; b, posterior, or ischiadic, articulation. 



FlG. 4. Pubes of Creosaurus atrox; front view; one-twelfth natural size 163 



a, acetabular surface; />, face for ilium; c, distal end. 

 Fig. 5. Lumbar vertebra of Creosaurus atrox; front view; one-sixth natural 



size 160 



Fig. li. The same; side view; seen from the left ; one-sixth natural size 160 



a, anterior articular face; d, diapophysis ; p, posterior articular face; s, 

 neural spine; c, anterior zygapophysis ; :', posterior zygapophysis. 

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