290 MEMOIRS OF THE CARNEGIE MUSEUM. 
backward, downward, and very slightly inward. The transverse processes display 
an advance over the preceding vertebre in the development of the metapophysis. 
The terminal portion of the transverse process is marked about its middle by a 
moderately deep sulcus separating the articulating face for the rib from the superior 
mammillary process which is directed strongly upward, terminating the outer 
extremity of the superior portion of the lamina which begins in this vertebra more 
distinctly to separate itself as an upward extension from the radix. The distance 
between the articulating faces for the heads of the ribs is distinctly greater than 
in the preceding vertebra. The anterior articulating surface in all the specimens 
appears to be supported upon a very short pedicel the superior margin of which 
forms a portion of the inferior boundary of the intervertebral foramen. ‘The 
upper lip of the posterior articulating face for the head of the rib is, as in the pre- 
ceding vertebra, carried upward and thickened antero-posteriorly in such a way 
as to largely form the posterior margin of the intervertebral foramen, three-fourths 
of the boundaries of which are included within the ninth vertebra. 
MEASUREMENTS OF NintH DorsaL VERTEBRA.*! 
1604, mm. 1714, mm. 1731, mm. 
Greatest height from base of centrum to top of spine..................- 235 153 
Greatest transverse diameter measured across transverse processes. ...... 130 94 
Greatest antero-posterior diameter measured from front of prezyga- 
pophyses to back of postzygapophyses...................--.+----- 90 75 
Length of centrum along floor of neural canal......................... 54 42 52 
Length of centrum along inferior surface... ............... 98205 o0ee 52 35 49 
Vertical diameter of anterior face of centrum........................-. 52 40 AT 
Transverse diameter of anterior face of centrum.....................-- 59 47 56 
Vertical diameter of posterior face of centrum.......................-. 54 40 50 
Transverse diameter of posterior face of centrum including faces for heads 
MEMS hs ets ies ch rpc gone PRS Oh ee 95 fil 78 
Verticalidramreteriofemeuralicanaleere sets soe ere ee ee 25 21 22 
Mransyersevdiameterof neurali canals. 24s eek eee eee 25 22 25 
Antero-posterior diameter of prezygapophyses......................... 21 21 r, 20, 1. 26 
Transverse diameter of prezygapophyses.......-....-.:.--++0:+++-++« NZ 15 me 5) Ile, ike} 
Distance across jprezycapophysesnnn.+ eee ee eee ee 60 45 48 
Antero-posterior diameter of postzygapophyses........................ 1s GO, Me BL ae, ay Me MS 
Transverse diameter of postzygapophyses...........................--: 17 r, 15, 1. 88 
Distanceyacross postzyeapopbyces: is ey sees eee ee ee 56 43 
Vertical diameter of anterior face for head of ribs...................... 27 14 18 
Horizontal diameter of anterior face for head of rib.................... 15 10 17 
Vertical diameter of posterior face for head of rib...................... 25 22 22 
31 Numbers italicized denote approximate measurements. 
® The left postzygapophysis is dwarfed. 
