HOLLAND AND PETERSON: OSTEOLOGY OF THE CHALICOTHEROIDEA. 293 
Vertical diameter of anterior face for heads of ribs..................-.00-0 eee e eee 24 22 il? 
Horizontal diameter of anterior face for head of rib.................00. 000 cece eee 13 13 16 
Vertical diameter of posterior face for head of rib...................---+2-+-- eee 30 27 25 
Horizontal diameter of posterior face for head of rib.............. 00.0.0 cece eee eee 22 20 22 
Antero-posterior diameter of face for tubercle of rib................. 0.0. e eee eee 24 22 
Transverse diameter of face for tubercle of rib... ..... 0.22.0... eects 22 24 Ee, 
Htrancverseraiam eterole Medi Geln mene c arin araeiva rm nie ear ciiied wae ole law ss ce ie he 3 25 26 32 
ANNIROADORISTOW ChENTECP Ot ACI, 6 cob oocsdboccceb ous eu bobouoodencoRdecauE sees 37 34 35 
DistancewbetweenwacesMorheadvolmibmemens sa eeronete ce roc ore icin aes 28 22 30 
Height of spine from neural canal to extremity... .. Fa ok cocoa Ss as ee EO eee ae ea 158 142 
Antero-posterior diameter of spine above neural canal....................-.0---0--- 45 40 
Antero-posterior diameter of spine at top.............. 0. cece e cece eee eee ee 30 28 
The Eleventh Dorsal Vertebra. 
But two specimens representing this element in the dorsal series were found. 
The first belongs to the series of dorsals designated in the Carnegie Museum 
Catalogue of Vertebrate Fossils as 1703C (see Fig. 56). It is very well preserved 
Fie. 55. Restoration in outline of eleventh dorsal Fie. 56. Eleventh dorsal of M. petersoni (C. M. Cat. 
of M. elatus (No. 1604). x4. Vert. Foss. No. 1703C). 4. 
and has sustained practically no injuries whatever. The other is a centrum 
belonging to the series numbered 1708. Using these specimens as models, Mr. 
Peterson has made for the mounted specimen No. 1604 an enlargement, modified 
so far as the end of the spine and the articulating faces are concerned in order to 
adjust itself to the preceding and succeeding vertebree in No. 1604 (see Fig. 55). 
In specimen No. 1708 the anterior margins of the prezygapophyses agree more 
nearly with the same surfaces in No. 1604 and look more directly forward than 
they do in the smaller specimen, showing that No. 1708 is a specimen of Moropus 
elatus Marsh. 
