38 PATAGONIAN EXPEDITIONS! PAL/EONTOLOGY. 



MEASUREMENTS. 



No. 15,515. No. 15,566. 



Atlas, transverse breadth .033 



" width of neural arch -Oi i 



" " " inferior arch .005 



Axis, width over anterior cotyles 026 .026 



No. 15,565. No. 15,566. 



Cervical mass, length (exclusive of odontoid) 0375 .038 



Odontoid process, length 009 .010 



Fifth cervical, length 008 



" " width 026 



First thoracic, length of centrum .o 1 1 



" " width of anterior face .02 1 



Second " length of centrum .01 1 



" " width of anterior face .016 



Third " length of centrum oil 



" " width of anterior face 017 



Fourth " length of centrum oio 



" " width of anterior face 014 



The remaining measurements of the vertebrae and limb-bones are all 

 taken from one specimen, No. 15,566. 



Eighth thoracic, length of centrum 012 Fourth caudal, width over transverse 



" " width of posterior face. .016 processes 052 



Eleventh " length of centrum 012 Seventh caudal, length of centrum 018 



" " width of posterior face . .017 Seventh caudal, width over transverse 



First lumbar, length of centrum 0125 processes 035 



" " width of posterior face ... .0175 Tenth caudal, length of centrum 018 



Second" length of centrum 0135 Tenth caudal, width over transverse 



" " width of anterior face 017 processes 0245 



Third " length of centrum 015 Thirteenth caudal, length of centrum .. .017 



" " width of anterior face I75 Thirteenth caudal, width over transverse 



Fourth " length of centrum 013 processes 019 



" " width of anterior face 0175 Fifteenth caudal, length of centrum ... .016 



" " " " posterior face ... .0185 Fifteenth caudal, width over transverse 



Sacrum, length 114 processes 016 



" width at first vertebra, dorsally. .030 ? Seventeenth caudal, length of cen- 



" " " " " ventrally . .025 trum 015 



Sacrum, width at last vertebra over trans ? Seventeenth caudal, width over trans- 

 verse processes 066 verse processes 0115 



First caudal, length of centrum 014 First rib, length ?-O43 



First caudal, width over transverse proc- " " width of distal end 035 



esses 070 Scapula, length 076 



Fourth caudal, length of centrum 016 " width of neck 020 



