EPOREODON 



79 



Specific Characters: The skull is about the length of that of E. occidentalism but the latter 

 is much wider and heavier of build. In comparison with E. montatms, the only eastern form of 

 comparable size, the Loomis species is smaller and does not have the arched superior profile. The 

 zygomata are moderately slender and gently downarched, with the maximum expansion apparently 

 at or near the malar portion. The nasal bones are acutely truncated posteriorly and probably uni- 

 form in width. The lacrimal bone has a moderate-sized pars facialis, bearing a small but deep 

 lacrimal fossa. The frontals are somewhat medially depressed and strongly convex in the outer 

 portions, and they extend forward beyond the lacrimal bones. The orbits are rather small and 

 anteroposterior! y suboval in shape. The temporal ridges unite in a plane just in advance of the 

 glenoid surfaces. The sagittal crest is low and extends about a fourth of the skull length. The 

 supraoccipital crest is produced beyond the occipital condyles, and the wings are not greatly 

 expanded. The brain case is well developed. The external auditory meatus is tubular and some- 

 what upwardly and posteriorly directed. The palate is wide and vaulted, with the palatonarial 



Fig. 39. — Eforeodon major relictus Loomis. Skull and superior dentition. 



(After Loomis, 1924.) 



HT. Cat. No. 13813 A.M.N.H. !/2nat.size. 



border produced posterior to the last molars. The basicranial axis is shallow. The glenoid articular 

 surfaces are large and nearly flat, and the postglenoid process is stout. The paroccipital process is 

 anteroposteriorly compressed, and the bulla; are of medium size. There is an unusually wide space 

 between the postglenoid and paroccipital processes, exposing the entire tympanic bone in side view. 

 Index: 0.56a. 



Foramina: The infraorbitals are above the interval between P 3 and P 4 . The supraorbital 

 foramina are 1 mm. apart, with grooves leading forward. The posterior palatine ones are 

 opposite M 1 . 



Dentition: Most of the teeth are considerably damaged but appear to be typical of the genus, 

 except for a trace of an anterior fossette on P 4 . The molar-premolar index is approximately 0.85. 



Skeleton: The fore limb is light and slender, that is, about the same as that of Merycoidodon 

 culberlsonii. 



Discussion: Loomis placed in this species Cat. No. 8949 A.M.N.H., which was designated by 

 Matthew as the type of his E. m. cedrensis. I do not consider at present that E. in. cedrensis and 

 E. m. relictus are synonymous, and therefore Cat. No. 8949 A.M.N.H. should not be included as a 

 specimen referred to E. m. relictus. However, see the discussion under E. m. cedrensis. 



