EXPLANATION OP PLATE 2. 



Cymbospondylus petrinus Leidy. 

 Lateral view of skull, no. 9950, X 1 /5- 

 From the Middle Triassic of West Humboklt Range, Nevada. 



LEGEND. 



Pm, premaxillary. Or, orbit. 



M, maxillary. Sq, sqtiamosal. 



N, nasal. St, supratemporal. 



L, lachrymal. Q, quadrate. 



F, frontal. Qj, quadratojugal. 



Pn, pineal foramen. At; articular. 



Pr, parietal. 8a, surangular. 



Pf, prefrontal and postfrontal. An, angular. 



Pto, postorbital. D, dentary. 



J, jugal. Sp, splenial. 



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