EXPLANATION OF PLATE 4. 



Cymbospondylus /xlrinii.t Leidy. 



Inferior view of skull, no. 9950, X Vr>- 



From the Middle Triassic of West Hmnboldt Iian.uv, Nevada. 



LEGEND. 



D, dentary. //, hyoid. 



Sp, splenial. Bs, basisphenoid. 



Sa, surangular. Bo, basioccipital. 



A, angular. Q, quadrate. 



V, prevomer? (J,j, (|uadrato.jugal. 



Pi, palatine. J, ju.ua I. 



Pt, pterygoid. Or, orbit. 



X, ectopterygoid ? 1'f, prefrontal and po.stf'rontal. 



[164] 



