282 MEMOIRS OF THE CARNEGIE MUSEUM. 
the process by a shallow constriction deeper on the lower anterior side than above. 
The articular surface looks outward, downward, and forward. The articulating 
surfaces of the centrum both before and behind are nearly vertical in position. 
MEASUREMENTS OF FourTH DorRSAL VERTEBRA.?® 
1604, 
mm. 
Greatest height from base of centrum to top of spine............ 808 
Greatest transverse diameter measured across transverse processes 165 
Greatest antero-posterior diameter measured from front of prezyga- 
pophyses to back of postzygapophyses.................... 63 
Length of centrum along floor of neural canal.................. 45 
Length of centrum along inferior surface...................... 5 
Vertical diameter of anterior face of centrum................... 50 
Transverse diameter of anterior face of centrum................ 57 
Vertical diameter of posterior face of centrum.................. 58 
Transverse diameter of posterior face of centrum including faces 
for head: of TIDS ie eyes. tees coe crcsev ate cae ee ec 108 
Werticalidiametenotneuralicanall aan aneece cee neti errr 28 
Transverse diameter of neural canal.......................... 30 
Antero-posterior diameter of prezygapophyses.................. 20 
Transverse diameter of prezygapophyses...................-.. 20 
Distance across;prezycapophysessmeaeeee eee eee eer: 60 
Antero-posterior diameter of postzygapophyses................. 26 
Transverse diameter of postzygapophyses...................... 21 
Distance across postzygapophyses................-+-+-+-see-s 66 
Vertical diameter of anterior face for head of rib............... 27 
Horizontal diameter of anterior face for head of rib............. 38 
Vertical diameter of posterior face for head of rib............... 35 
Horizontal diameter of posterior face for head of rib............ 29 
Antero-posterior diameter of surface for tubercle of rib.......... 30 
Vertical diameter of surface for tubercle of rib................. 20 
Mransversevdiameter ofpedicelaae nee neeeeeneeeererrereee 40 
Antero-posterior diameter of pedicel.................--.------ 30 
Distance between faces for head of rib..................... oO 
Height of spine from neural canal to extremity................. 240 
Antero-posterior diameter of spine above neural canal........... 45 
Antero-posterior diameter of spine at top..............-.-.-.-. 34 
Fifth Dorsal Vertebra. 
1703B, 1712, 
mm. mm. 
222 295 
130 129 
66 65 
38 41 
38 38 
40 50 
40 47 
43 55 
90 102 
27 26 
25 26 
22 r. 23, 1. 
19 22 
60 62 
19 18 
rey Uf} UL, 1G} te; IG, I 
55 50 
25 32 
28 32 
28 32 
23 On 
23 17 
20 17 
32 30 
25 25 
2 2 
163 230 
30 35 
22 30 
14 
Three specimens of the fifth dorsal of Moropus were recovered in the Agate 
Spring Quarries, No. 1604, No. 1712, and No. 1718. The vertebra of No. 1604 is 
26 Numbers italicized indicate that they are only approximate, the specimen having been broken or 
restored. 
