HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 315 
Length of centrum along floor of neural canal..........:............-.20-00:- 65 62 62 70 
ikenothyotscenthumsealonacimieriormsurtacere mun minrine ens ae eee ce he Lge 62 60 5d 50 
Vertical diameter of anterior face of centrum...............00..000.0cc0ceeese 57 43 52 57 
Transverse diameter of anterior face of centrum....................0.0.e evens 107 78 87 80 
Werticalrdiameter of posterior faceot centrum) 9 o4- oss ean ceeds) 2). oslo 58 45 53 60 
Transverse diameter of posterior face of centrum...................06000 eee 112 85 100 93 
Werntical diameter of meuralucamallcense a eipunte erp mite ass lc eis e ccloeh oe 27 25 27 
Nransversexaameenoimnenralecanaler | ciescite na erse ee Noms ae. lees Agee 40 36 33 
Antero-posterior diameter of prezygapophysial surfaces................--...04- B4 25 29 
Vertical diameter of prezygapophysial surfaces...............0.000-00eeeeeeee 40 27 38 
Distance between prezygapophysial surfaces above................-..0000000s 52 55 57 
Antero-posterior diameter of postzygapophyses...............00000eeeee scene 30 25 31 
Weruicaladiamerenon posuzyeapoply Ses .res sci seins ce os dee 34 23 35 
Distancelacrossspostayeapophyses| aboveri... 4244 ses: dekh ee se nec 67 50 57 ae 
transverse diam eteroipeaicelecy. 4 sek. cua ae Se ee ee ee 26 15 20 20 
AMbero-pOsveriory diame temorpediceleisats. se). dive cloe Sess s Woe aes se 42 40 49 49 
Height ofspineirommeuralicanal toextremity.. 9.4)... 4) 426s. Jones oe 162 so le 
Antero-posterior diameter of spine above neural canal.......................-- 50 40 52 
AMIGELO-DOSteMOLdiameterolspimerattOpr vat Aenea esa Gee se 39 Ne 47 
Height of metapophysis above prezygapophysial face.................-...00-- 12 5 3 
Height of metapophysis above transverse process............---.00000eeeeeeee 70 51 57 
Antero-posterior diameter of metapophysis below....................-+00+0005- 82 25 35 
Antero-posterior diameter of metapophysis (mammillary) at end............... 22 18 25 
Distance;acrossiendsior metapopmysesmaici sae danse s ee esses eae 116 82 105 
The Sacral Vertebre. 
(Plates LITI-LX.) 
Six specimens representing the sacral vertebree have been made the subject 
of critical investigation. No. 1704 (Plates LIII-LVI) is a sacrum in which the 
centra and lateral processes are well preserved, but from which the extremities of 
the neural spines have been broken away, with the exception of the third, the 
greater portion of which remains. It is evidently the sacrum of an adult in which 
the vertebre are thoroughly codssified. No. 1706 is the sacrum employed in the 
restoration of the mounted skeleton, and which is figured in Plates LVII-LX. 
It is in the main well preserved and has called for only a little repairing. It was 
found about twelve feet from the remains of the specimen catalogued as No. 1604 
and may well have belonged to that individual. Specimen No. 1713 is the first 
sacral vertebra of a large but immature individual, the spine of which shows that 
cooéssification has not as yet taken place at its extremity, and the posterior epiphysis 
of the centrum has been lost. It is practically a perfect specimen with the ex- 
ceptions just noted. No. 1714 is a specimen of the first sacral of quite small size 
