Douglass : New Merycoidodonts. 103 



In the Carnegie Museum collection are two skulls (Nos. 908 and 

 1234) both of which are somewhat crushed vertically ; but the original 

 form was evidently rather low and broad and the upper contour nearly 

 straight. The nasals are unreduced in length. They narrow quite 

 rapidly anteriorly and gradually posteriorly to near the anterior por- 

 tion of their contact with the maxillaries. The sagittal crest is thin 

 but only moderately high. The malar is quite heavy beneath the 

 orbits, but the zygomatic process of the temporal is long and slender. 

 Its posterior upper angle is curved inward, scroll-shaped and nearer 

 to the orbit than to the posterior part of the skull. The occiput is 

 low and the external wings broad. 



The tympanic bullae are inflated, but not extremely large. The 

 post-glenoid processes are external to the anterior portions of the bullae, 

 while the inner, thickened portions of the paroccipital processes are 

 posterior to the outer portions of the bullae. The external auditory 

 meatus opens at the supra-auricular border. 



The teeth are characteristic. They are only moderately hypsodont. 

 The molar is larger than the premolar series in both jaws. The upper 

 molar and premolar teeth in the type, with the exception of P^ are 

 heavier than those figured by Scott as Mesoreodon chelonyx in his 

 " Mammalia of the Deep River Beds " ; the length is nearly the same, 

 but they are much wider. The premolars are not triangular, but are more 

 quadrate. P^ which is much larger than Pi, is oblique, being directed 

 antero-internally and postero-externally. The cingulum which almost 

 forms a cusp on the postero-internal portion of the tooth encloses a 

 comparatively broad, shallow basin. On P^ this postero-internal cusp 

 is large. In specimen No. 1234 the teeth are not so heavy, and the 

 skull may have belonged to a female. The length of the few foot 

 bones which are preserved are nearly the same as those figured by Scott. 



Measurements. 



mm. 

 Total length of skull 244 



Height of skull above angle of mandible approximately 155 



Greatest width of skull 140 



Length of molar-premolar seiies 125 



Length of premolar series 57 



Length of molar series 68 



