970 THE JOHN DAY FAUNA. 



above mentioned, in having the superior half of the posterior face of the 

 neural spine grooved. The inferior half has a keel, which becomes very 

 prominent to a point opposite the commencement of the zygapophyses and 

 then suddenly subsides, as in U. concolor. The postzygapophyses are 

 recurved outwards on the first dorsal ; on the second they are plane, and 

 slope downwards outwards. The center of both are as long as those of the 

 last cervicals, are depressed, and have two weak angles on the inferior face. 



Measurements of vertebrae. 



M. 



Length of cervical vertebrae 200 



Transverse extent of atlas 090 



Transverse extent of transverse process of atlas 025 



Length of centrum of axis on side 022 



Elevation of centrum and neural canal of axis anteriorly 029 



C anteroposterior 025 



Diameters of centrum of fourth cervical < vertical in front 012 



( transverse in front 020 



Transverse extent with processes 054 



( anteroposterior 024 



Diameters sixth cervical < (vertical .013 



i posterior^ 



^ I transverse 026 



Diameter with transverse processes .050 



Expanse of prezygapophyses 035 



c anteroposterior 022 



Diameters centrum first dorsal < , J vertical 013 



( ( transverse (without rib facets) 017 



E'evation of neural canal in front Oil 



Elevation of neural arch and spine 055 



Expanse of postzygapophyses : . . .025 



Expanse of postzygapophyses second dorsal 022 



Expanse of diapophyses second dorsal 050 



Anteroposterior diameter neural spine at base 017 



These vertebrae are represented in PI. LXXIIa, fig. 3. 



The second specimen of the Nimravus gompliodus consists of the pos- 

 terior part of a mandibular ramus supporting teeth. Its dimensions are a 

 little smaller than those of the type. 



The third specimen includes a complete mandibular ramus with all the 

 teeth, some dorsal vertebrae, and a femur. These pieces wei'e found in 

 juxtaposition in the same block of stone, and agree iu proportions. The 

 specimen was as large as No. 1. The left femur is perfectly preserved, and 

 is represented in Plate LXXIV, fig. 2. It is rather long and slender, hav- 

 ing nearly the size and proportions found in the leopard and panther. Its 

 little trochanter is more prominent than in either of those species, and the 



