B 



I'lG. 29. Labidosaurus hamatus Cope. Cotylosaur skull: A, from below, B, from the side. 

 Two thirds natural size, a, articular; an, angular; bs, basisphenoid; ep, epiotic; ^.v, exoc- 

 cipital; pp, postparietal; pt, pterygoid; q, quadrate; st, stapes. 



41 



