Cope.] 5d4 [j an . i 8t 



trace of cinguluin on the superior molars is on the inner base of the ante- 

 rior lobe, where it is weak, and in the interspace between the internal 

 lobes, where it is a narrow tubercle. Enamel obsoletely vertically striate. 

 It is wanting on the external side of the internal crescent, as Leidy has 

 shown to be the case in certain species of Merychyus. The fifth lobe of 

 the last inferior molar is well developed and has its two crescents separated 

 by a groove. The adjacent horns of the external crescents are of about 

 equal length. No cingula, except a trace on front and rear of crowns, and 

 a tubercle between the bases of the external lobes. The fourth premolar has 

 two fossae isolated, one anterior to and the other posterior to the principal 

 apex, which is double, and anterior to the middle. Before wear, each of 

 these fossa? opens inwards. The crown of the third premolar has its inner 

 face unequally divided by a crest behind the middle. Posterior to this 

 the space is occupied on the inner side by two shallow fossae of which the 

 posterior is the narrower. Anterior part of inner face of crown concave. 

 One principal angular cusp. The second premolar has a compressed 

 triangular crown with a long base, and a weak vertical ridge on the in- 

 ternal side. The first premolar is a very robust tooth with a straight 

 posterior border directed at 95° forwards, and is vertically truncate in the 

 specimen by friction with the canine. Section of crown lenticular, 



rounded in front. 



Measurements. M. 



No. 1. ; - 



Length from occipital condyle to postglenoid process. . . .049 



'* " " " " postfrontal process... .135 

 Width of occiput at posttemporal crests 054 



" " " condyles 102 



Elevation of occiput above foramen magnum 084 



Length from foramen magnum to palatal border 060 



Width between apices of otic bullae. 042 



Length from inferior m. iii to apex of coronoid process. .075 



" of superior true molar series 084 



Diameters m. i { anteroposterior , . . . .026 



*. transverse (at middle rib) .025 



Diameters m. m { anteroposterior. -......«, «* 



I transverse (at middle rib) 025 



Length of inferior true molar series 085 



t.. . t> • f anteroposterior 0205 



Diameters P-m. iv < , , . , 



*• transverse behind 015 



Diameters m. i { anteroposterior 022 



I transverse , 01b 



Diameters m. iii {anteroposterior 040 



t transverse 022 



No. 2. 



Length of ramus mandibuli from incisive border to 



condyle (oblique) 280 



