Page:The Osteology of the Reptiles.pdf/59



. 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; ex, exoccipital; pp, postparietal; pt, pterygoid; q, quadrate; st, stapes.