EPOREODON 



87 



glenoid surface. The sagittal crest is thin, of medium height, and equal in length to about a fourth 

 of the total skull length. The supraoccipital crest is produced beyond the line of the occipital 

 condyles, and the wings are not widespread. The brain case is well developed, with a convexity near 



/J//<? TrPE 

 V.PM. 



Fig. 47. — Eforeodon socidis Marsh. Superior view of skull. CT. Cat. No. 13118 Y.P.M. 1/2 nat. size, aff, 

 anterior palatine foramen; /, frontal; if, infraorbital foramen; //, lacrimal or antorbital fossa; mx, maxilla; n, nasal; 

 nc, supraoccipital or nuchal crest; f, parietal; fc, sagittal or parietal crest; fmx, premaxilla; foe, postorbital constriction; 

 fof, postorbital or supraorbital process of frontal; s, squamosal; sof, supraorbital foramen; za, zygomatic arch. (After 

 Thorpe, 1931.) 



Whm 9 ! 



fpf ajif p 



oc |qi ie fim fo jilp. 



Fig. 48. — Eforeodon socidis Marsh. Inferior view of skull. CT. Cat. No. 13118 Y.P.M. 1/2 nat. size, afj, 

 anterior palatine foramen; b, auditory bulla; ba, basion; bo, basioccipital ; cf, condylar or hypoglossal foramen; flm, 

 foramen lacerum medium and anterior opening of carotid canal; flf, foramen lacerum posterius; fm, foramen magnum; 

 fo, foramen ovale; gf, glenoid fossa; oc, occipital condyle; f, prosthion; fg, postglenoid process of squamosal or glenoid 

 tubercle; fgf, postglenoid fossa; ff, paroccipital or paramastoid process; fff, posterior palatine foramen; ftf, pterygoid 

 process of palatine; sf, sphenoidal fissure or foramen lacerum anterius; sm, stylomastoid foramen; sfh, sphenoid or basi- 

 sphenoid; te, point of articulation of tympanohyal element of hyoid arch. (After Thorpe, 1931.) 



the parietosquamosal suture. The external auditory meatus is large and tubular, with a direction 

 that is markedly upward, outward, and somewhat backward. The palate (Fig. 48) is wide and 

 decidedly uparched, and the U-shaped palatonarial border is well back of the last teeth. The basi- 

 cranial axis is shallow. The glenoid articular surface is gently convex, and the postglenoid process 

 is prominent and nearly as long as the glenoid surface. The paroccipital process is triangular to sub- 

 round in cross section, and the base is closely appressed to the moderately large bulla, which is 

 transversely very much compressed and anteroposteriorly elongated. Index: 0.45. 



