HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHHEROIDEA. 317 
dorsal foramen is smaller than the other two; the second ventral foramen is inter- 
mediate in size between the first and the third. The metapophyses of the first 
sacral are well developed and are conformed in shape and size to those of the 
preceding lumbars. In the second and third sacral vertebre the metapophyses 
appear as small elevations, that of the second vertebra being larger than that of 
the third, which is reduced to a mere tubercle. 
The three sacra found in a coossified condition have been attentively studied 
and their measurements so far as their somewhat defective condition allows are 
here given. 
MEASUREMENTS OF SAcRUM.*® 
1704, 1706, 2102, 
mm. mm. mm. 
Greatest transverse diameter in front across ends of ale..................6-.2----- 224 218 218 
Greatest transverse diameter behind across ends of ale...................-+0000--- 147 137 
Greatestheichtiromsbase torendvot spines). 2 ....6 4.42200 ese ee ce ae eee ee: 195 210 
Greatest lengthtalong median line of centra below... 42. >.-4)..0....2.5..........: 190 185 
Length of neural canal measured along top of centra...................-.-.-- ease 180 177 
Wencthvomneuralicanaltal ongeneuraleanchiey tes ee eseere ee ry ee ee 140 «147 
Vertical diameter of neural canal in front..................-..2.. 020. - esses eee 26 19 23 
Werticalidiamesenomneunalkcanalibehinde erent saan ose ey yee ae ee 12 16 
iransyersediametermomneunalucanalmmerrontiee eqs ee eae nae ss eee 42 47 50 
Transverse diameter of neural canal behind......................6 2.000.002.0502 00e 21 19 
Verticalsheightiol spines) above meuralvanch. .2 450-2250 4-6 a -5 sa see 150 130 
Greatest antero-posterior diameter of mass of laterally codssified ale................ 177 200 
Greatest vertical diameter of ale of first sacral in front................. te eee 120 95 100 
Vertical diameter of anterior face of first sacral..:....................-...2-.--5.- 50 44 50 
Transverse diameter of anterior face of first sacral...................2..00..02005- 100 103 105 
Werpicaladiameternohposteriomaceonlounthisacrall ae 8 satan 8) 950.) eee 12 18 
Transverse diameter of posterior face of fourth sacral.........................-..- 27 40 
Antero-posterior diameter of first ventral foramen........................-0000--- 38 AO 35 
Transverse diameter of first ventral foramen.........................---..-- Ree 18 20 13 
Antero-posterior diameter of second ventral foramen..........................00-. 16 10 
Transverse diameter of second ventral foramen....................0... 000s eee eee 20 10 16 
Antero-posterior diameter of third ventral foramen.......................-..2005- 16 11 
Transverse diameter of third ventral foramen........................-.00-.---000- 13 a 
Antero-posterior diameter of first dorsal foramen..................00.-00002- 2000 17 16 U7 
ikransverseidiamevemonnurst dorsal foramens enn sss oe seen nee sane ose oes so. 13 14 10 
Antero-posterior diameter of second dorsal foramen.......................0220-05- 9 13 
Transverse diameter of second dorsal foramen....................0 00. c eects 13 11 
Antero-posterior diameter of third dorsal foramen.......................0.-00-00- 12 8 
Transverse diameter of third dorsal foramen....................00.0 cece sees ee eee 20 14 
46 Wigures italicized indicate approximate measurements, the specimens being broken or restored. 
