PLATE 2 



EXPLANATION OF FIGURES 



4 Outline of the cranial elements of Diplocaulus magnicornis Cope. E, epiotic; 

 F, frontal; J, jngal; Mx, maxilla; N, nasal; P, parietal; Pf, postfrontal; Po, post- 

 orbital; Pr, prefrontal; Px, premaxilla; Qj, quadratojugal; So, supraoccdpital; 

 Sq, squamosal; St, supratemporal. 



5 Mandible from the side to show arrangement of the operculo-mandibular 

 canal. 



6 Outline of the openings and elements of the palate of the skull. .1./', internal 

 nares; Co, condyle; Ep, epiotic; Es, auditory fossa or ear slit; Exo, exoccipital; 

 Mx, maxilla; Pa, parasphenoid; Paf, palatine foramen; Pal, palatine; Pi, ptery- 

 goid; Px, premaxilla; Q, quadrate; Qj, quadratojugal; T, ectopterygoid or trans- 

 ver.se bone. 



7 Side view of the skull. J, jugal; Mx, maxilla; Pr, prefrontal; Px, premaxilla; 

 Qi, quadratojugal; .S7. squamosal. 



42 



