Cope.] 544 tJan . J8> 



extent posteriorly. Enamel smooth. The last inferior molar is not so 



disproportionately larger than the second as in M. leptorhynohus, arenarum 



and elegans ; and with the second, has little of a prismatic character. No 



cingula. 



Measurements. M. 



Length from occipital condyle to postglenoid process. . . .047 



" " " " " postfrontal process. . . .101 



Vertical diameter of orbit 036 



Depth of malar bone at middle of orbit 012 



" " zygomatic process at posterior angle 024 



"Vyidth at middle of supraorbital border 060 



" " malar bones 090 



" of occipital condyles 032 



" " occiput at lateral crests 036 



"condyles 061 



Elevation of occiput with condyles 054 



Depth of skull at glenoid surface 058 



" " " " orbit, exclus. malar 054 



" " mandible at condyle 075 



" " " " coronoid 083 



" " " " posterior edge of m. iii 042 



Depth mandible at middle of m. ii 028 



-r.. . . .. f anteroposterior 016 



Diameters superior m. n < l 



•-transverse 016 



t-.. . . ... f anteroposterior 020 



Diameters superior m. ni < F 



(. transverse 0155 



Diameters inferior m. ii { anteroposterior 015 



•- transverse 012 



Diameters inferior m. iii { anteroposterior 0225 



t transverse .Olio 



A second specimen of this species consists of the occipital, parietal, and 

 part of the frontal regions, with the right maxillary bone, and fragments 

 of the left maxillary, of the mandible, etc. The latter demonstrates the 

 position of the infraorbital foramen to be above the anterior border of the 

 fourth superior premolar. The middle line of the occiput presents a keel 

 on its superior half. The basioccipital bone between the paroccipital pro- 

 cess is expanded laterally, and is without median angle or groove. Between 

 the bullse it is compressed, and its middle line forms a narrow truncation. 

 Opposite the posterior third of the bulla, this surface ascends at an angle, 

 and gradually widening, spreads into the general flattened convex inferior 

 face of the sphenoid. The anterior part of the sagittal crest is a little 

 better developed than in the typical specimen. The worn teeth indicate 

 an old individual. The canine is large, and the first premolar has its 

 roots well distinguished. The facial plate of the maxillary concave above 

 second premolar. No appreciable diastema. 



