Peterson: Material Discovered in Uinta Basin. 139 



CHALICOTHEROIDEA}^'' 

 Subfamily SCHIZOTHERIIN^? Holland and Peterson. 

 Genus EomoRopus Osborn. 

 42. Eomoropus annectens sp. nov. (Plate XXXVI, Fig. 2). 



Type: Portion of skull with the cheek-dentition in position, C. M. 

 No. 3109. 



Horizon: Uinta Eocene, Horizon B. 



Locality: Eastern portion of Uinta Basin, near Wagon-hound Bend, 

 on White River, Utah. 



Specific Characters: Skull comparatively narroi.v across the orbit and 

 palate, long in the cranial region, less suddenly contracted laterally in 

 the region of the orbit, and a lighter post-glenoid process •when compared 

 icith E. amarorum. The type also indicates a considerable smaller 

 animal than the latter. 



From the character available for comparison with the type specimen 

 of Eomoropus amarorum (Cope) the present species is, as already said, 

 of considerably smaller size, especially in the dentition. Eomoropus 

 amarorum differs from E. annectens by the relatively greater measure- 

 ments across the maxillary from the inner face of M- to the lower 

 external face of the jugal, as seen in the illustrations given by Pro- 

 fessors Cope^^^ and Osborn,"^ as well as on the actual comparison of 

 the specimens by the writer. The entire posterior portion of the skull 

 of E. annectens, except the postglenoid process, was weathered out of 

 the sandstone in which the maxillaries w^ere found. The process 

 appears to be in its natural position with relation to the zygomatic 

 arch and maxillaries. From this fact it is presumed that there is a 

 relatively greater distance between M- and the postglenoid process 

 in the present species than in E. amarorum. 



There were probably only three premolars present. Through their 

 relatively small size and the details of structure the premolars suggest 

 those of Schizotheriiim priscum (Gaudry) in a remarkable manner. 

 The molars on the other hand are proportionally shorter and broader. 

 Furthermore the parastyle is more loosely connected with the para- 

 cone, and the vertical ridge on the external face of the paracone is 



"'^Professor Osborn has recently (Bull. Amer. Nat. Hist., Vol. XXXII, 1913, 

 pp. 261-274) placed Triplopiis aynaroriiin Cope in a distinct genus of the Super- 

 family Chalicotheroidea. 



138 Tertiary Vertebrata, PI. LVIIIa, Fig. 20. 



"^ L.c, page 262, Fig. 2a. 



