218 MEMOIRS OF THE CARNEGIE MUSEUM 
MEASUREMENTS OF AXIS. 
Antero-posterior diameter of the centrum, odontoid process included 
Greatest transverse diameter of centrum, anteriorly 
Greatest transverse diameter of centrum, posteriOrly..........scccoos scccccsscerersesrererscserescenee saeserecsene 
Antero-posterior diameter of spine 
Transverse diameter across postzygapophyse: 
Third Cervical Vertebra. —'The general characters of the third cervical vertebra 
are similar to those of the same bone in Canis, though certain features are rather 
feline. Thus the inferior branch of the transverse process is strongly developed, the 
tubercle superior to the postzygapophysis is large and points directly backwards, 
and the neural spine is considerably developed, while in Canis the transverse process 
is smooth, the tubercle above the postzygapophysis points more upwardly and the 
neural spine is less developed. ‘The centrum is short and has a strong keel, which 
terminates posteriorly in a broad area, but does not form a hypopophysial tubercle 
as in the dogs; the transverse process is shorter and broader, and the vertebrar- 
terial canal is longer. 
MEASUREMENTS OF THIRD CERVICAL VERTEBRA. 
Antero-posterior diameter of centrum 
Antero-posterior diameter of neural arch including zygapophyses. 
Transverse diameter across transverse processes, posteriorly 
Transverse diameter of centrum posteriorly.......csccccccee sesssseencereeecessnueecceseesss ens eeseeeenersesenaanene 22 
Vertical diameter of centrum posteriorly..........ssssccocecsssesesescccescensenasconsccsscneceasssecesacsensseseesees 14 
Fourth and Fifth Cervical Vertebre.— The fourth and fifth cervical vertebre 
are heavier than the preceding vertebra. The postero-inferior branch, or costal 
element of the transverse process, 
is also more developed ; the neural 
arches are more deeply emarginated 
in front and behind; the neural 
spines are higher and the tubercles 
above the postzygapophyses are 
smaller. There are otherwise no 
Fia. 8. Fifth Cervical Vertebra of D. superbus. } nat. size. 1, marked differences between the 
posterior view ; 2, lateral view ; 3, anterior view. 
third, fourth, and fifth cervical ver- 
tebree. In the two latter vertebrae the ventral keel of the centrum does not termi- 
nate posteriorly in a tubercle as in Canis, but laterally has a broad area with small 
tubercles, similar to what is observed in Felis leo. 
