HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 261 
The postzygapophyses are massive and look downwardly and outwardly. 
Their articulating faces are subrotund in most cases, though in No. 1604 they are 
somewhat oval, and at their outer extremities somewhat pointed. 
MEASUREMENTS OF AXIS. 
No. 1604, No. 1713, No. 1703, No. 1724, No. 1725, 
mm. mm. mm. mm. mm. 
Greatest length between tip of odontoid and margin of 
centrum between perpendiculars................. 220 203 173 162 158 
Height to top of neural spine....................... 167 152 134 127 140 
Length of centrum along under surface exclusive of 
Odontordkprocessier wii insets deren 148 138 126 112 108 
Antero-posterior diameter of pedicel................. 90 88 77 73 75 
Transverse diameter across posterior margins of pre- 
Zi CADOPMY SESH en eee cite eae noone ee 120 113 90 108 98 
Transverse diameter across postzygapophyses......... 140 120 100 115 98 
Transverse diameter of vertebra across ends of trans- 
VELSCHDTOCESSES pty Den aig sey ait elceaichasuselant sustateracene 130 110 97 105 96 
Transverse diameter of articular faces of postzyga- 
FOLD) OV REIS os os es Se a I soe ete oes a eer 65 57 45 50 48 
Vertical diameter of neural canal.................... 30 25 25 30 24 
Transverse diameter of neural canal................. 25 20 13 20 20 
Length of odontoid process..............-.+20eee00 72 65 47 50 50 
Transverse diameter of neural canal at base of odontoid 
DEOCCSS Pee eR oaseeraieied Mansa tie tates 45 35 35 35 30 
Vertical diameter of odontoid process from floor of 
MUTA CATE me Mepenutear een ee Erma esd a lect aleve sien ciaee 18 18 10 20 20 
Transverse diameter of peg-like projection............ 20 17 7 15 15 
Vertical diameter of peg-like projection............... 24 20 11 15 14 
Horizontal diameter of peg-like projection............ 25 25 17 20 20 
Horizontal diameter of articulating face of “spout” at 
TTL OUD a2). Bidraes ois Scr oloe BS Oe oes ees eae eo 65 60 50 50 43 
Vertical diameter of articulating face of ‘‘spout” at 
TUNG CLL Clee taper eeePb rey ne wc pe aR Mey Aes Mucn ar 33 35 23 35 35 
Transverse diameter of posterior face of centrum...... 65 60 49 53 45 
Supero-inferior diameter of posterior face of centrum... 70 65 50 50 50 
Vertical height of posterior face of centrum measured 
perpendicularly save emesis ste kee eerie scpecses 54 48 38 38 42 
Height of keel of centrum at middle................. 40 32 20 22 20 
Distance to floor of neural canal from bottom of keel at 
TTC CLL pure ere erate Pa a hte ence acai ct 5 45 43 35 37 42 
Transverse diameter of neural spine in front.......... 5 5 5 5 
Transverse diameter of neural spine above origin of 
MOStzy.capophysesme see wees eo eae 63 30 30 30 30 
Antero-posterior diameter of neural spine at top........ 165 165 130 136 140 
