280 MEMOIRS OF THE CARNEGIE MUSEUM. 
The spine of the third dorsal vertebra is relatively longer than that of the 
Gm 
Fria. 48. Third dorsal of Moropus peterson (No. 
1703B). 1, lateral view; 2, posterior view. 4. 
second dorsal. It is, like the second, tri- 
angular in horizontal cross-section, but 
broader behind than the second and shorter 
in its antero-posterior diameter. The tu- 
bercular end of the transverse process is 
smaller than in the second vertebra and the 
articulating face for the tubercle looks 
downward, outward, and slightly forward. 
The prezygapophyses look upward and out- 
ward; the postzygapophyses look downward 
and inward. The articulating surfaces of 
the centrum resemble those of the second 
dorsal, and the body of the centrum is 
clasped from before and behind by the 
median projections of the epiphyses on the under side, which form a low keel. 
MEASUREMENTS OF THIRD DorsAL VERTEBRA.?® 
1604, 1703B, 1712, 
mm. mm. mm. 
Greatest height from base of centrum to top of spine..................------ 827 250 310 
Greatest transverse diameter, measured across transverse processes..........- 166 130 145 
Greatest antero-posterior diameter, measured from front of prezygapophyses to 
packzol Postzygapop hy.SeS mers wacer PreN sree ee a eae wean 78 63 70 
ibengthroficentrum) alone floorjoimeuralicanale. see eee ee eee 52 43 50 
Wenethrocentrumbalongsinter orm suntace myc s nee eee 45 25 37 
Vertical diameter of anterior face of centrum............................-.- 55 45 ~ 48 
Transverse diameter of anterior face of centrum................---++-+++-e- 4l 41 42 
Vertical diameter of posterior face OLcentrumMy: ...5 2am ERE eee 60 45 55 
Transverse diameter of posterior face of centrum including faces for head of ribs 101 86 98 
Menticalediametenofmeunalltcein all esse narra ete aaa ae 26 28 33 
Miransyversexcireann eterolaneutallacairiell egies n ee eae ea 28 28 33 
Antero-posterior diameter of prezygapophyses...........................-.. tr. 20) 2% 28 36 
Mransverse diameter of prezyeapophysesi... ose aenece ee ee eee eee ee me 1S), 43) Se/ 25 
IMI shANCerACLOSSIOREZVCADOD Ly. SESe repent er eae nen ee 60 70 75 
Antero-posterior diameter of postzygapophyses...............-..0--eee-eeee 22 DOM E25 nl 20 
Transverse diameter of postzygapophyses--< seis eee ee eee oer 2 15 20 
Distance acrossipOSuZy 2a Op biyCeS ener tenet teeta eae te ee 58 55 62 
Transverse diameter of anterior face for head of ribs........................ 26 23 25 
Horizontal diameter of anterior face for head of ribs........................ 35 28 34 
Transverse diameter of posterior face for head of ribs....................... 25 20 24 
°° Numbers italicized indicate that at the point of measurement the specimen has been injured or restored. 
