CASE— COTYLOSAURIA 



1. Lower view of skull of Labidosaurus hamatus, from Williston. XI. Restored from No. 

 641 Univ. of Chicago, s, splenial; pa, palatine; an, angular; pi, pterygoid; bs, basisphe- 

 noid; a, articular; st, stapes; ep, quadratojugal; ex, exoccipital; pp, paroccipital. 



1. Posterior surface of same, pp, paroccipital; ep, quadratojugal; a, quadrate. 



3. Occipital region of same. />/, pterygoid; ept, epipterygoid. 



4. Lateral view of same. X 1. 



