HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 287 
metapophysis, which is still fused with the rest of the process and terminates 
exteriorly in a rugose mammillary extremity, between 
the lower margin of which and the rim of the tuber- 
cular facet is a shallow constriction. The distance 
between the articular faces for the heads of the ribs 
is greatly increased in this vertebra. The articulat- 
ing faces of the centrum are perpendicular. The 
prezygapophyses look almost directly upward, very 
slightly outward and forward. The postzygapoph- 
yses look downward, very slightly backward and in- 
ward. The articular faces for the tubercle of the rib 
look outward and a little forward. The upper half 
of the anterior face for the head of the rib is sup- 
ported as in the sixth dorsal, but les farther back and 
more on the under side of the radix than in the pre- 
ceding vertebra. The upper lip-like margin of the 
posterior face for the head of the rib assists, as in 
(No. 1604). 
Xt. 
the sixth dorsal, in forming a considerable portion of the posterior wall of the inter- 
vertebral foramen. 
MEASUREMENTS OF SEVENTH DorsaL VERTEBRA.29 
1604, 
mm. 
Greatest height from base of centrum to top of spine.......... 245 
Greatest transverse diameter measured across transverse proc- 
Greatest antero-posterior diameter measured from front of pre- 
zygapophyses to back of postzygapophyses............... 74 
Length of centrum along floor of neural canal................. 50 
Length of centrum along inferior surface..................... 48 
Vertical diameter of anterior face of centrum................. 47 
Transverse diameter of anterior face of centrum............... 50 
Vertical diameter of posterior face of centrum................. 50 
Transverse diameter of posterior face of centrum including faces 
aitoypJaveyeKol Opt JellostG G25 cs echoed eke Sloe eG Soe Bite a eee 100 
Vertical diameter of neural canal............................ 26 
Transverse diameter of neural canal......................... 26 
Antero-posterior diameter of prezygapophyses................ 20 
Transverse diameter of prezygapophyses..................... r. 16, 1 
Distance across prezygapophyses...............-...-.-...0-- 60 
Antero-posterior diameter of postzygapophyses................ 26 
2 Numbers in italics represent approximate measurements. 
1703C, 
mm. 
194 
98 
60 
41 
39 
38 
42 
39 
65 
18 
20 
r. 20, 1. 
220) ron. 
38 
23 
15 
13 
1713, 
mm. 
238 
128 
70 
39 
40 
46 
54 
46 
90 
24 
24 
15 
17 
Dd - 
24 
1714, 
mm. 
195 
118 
