PLATE LXXVIT. 



Brain casts of dinosaurs. 



Page. 

 Fig. 1. Brain cast of Sleyosaurus uiiynlatiis Marsh; side view; one-fourth nat- 

 ural size 188 



Fig. 2. Brain cast of Ceratosaurus nasicorvis Marsh; side view; one-fourth 



natural size 159 



Fig. 3. The same of Claoeaurus annectens Marsh; side view; one-fonrth nat- 

 ural size ■. 222 



Fig. 4. The same of Triceratops serratus Marsh; side view; one-half natural 



size ... .' 227 



Fig. 5. Brain cast of young alligator; for comparison; top view; three- 

 fourths natural size 187 



c, cerebral hemispheres; cb, cerebellum; m, medulla; ol, olfactory lobe; 

 on, optic nerve; op, optic lobe; p, pituitary body; V, fifth nerve; 

 X, XI, tenth and eleventh nerves; XII, twelfth nerve. 



398 



