SINCLAIR ! MARSUPIALIA OF THE SANTA CRUZ BEDS. 389 
No. 
15,04.6. 
No. 15,170 
M ? , antero -posterior diameter ...... 
.0095 
.0096 
“ transverse “ 
.005 
.0047 
Atlas, width across anterior cotyles .... 
•0325 
“ “ of neural arch ..... 
.0136 
“ “ “ inferior “ (approximate) . 
.008 
Axis, length of centrum including odontoid 
•034 
“ width across anterior cotyles .... 
.0225 
“ approximate length of neural spine . 
.044 
“ “ height “ “ “ above floor 
of neural canal ...... 
.022 
Third cervical, length of centrum .... 
.019 
“ “ width across prezygapophyses 
.022 
Fourth cervical, length of centrum .... 
.017 
“ “ width across prezygapophyses . 
.023 
Fifth cervical, length of centrum ..... 
.0175 
“ width across prezygapophyses 
.024 
“ “ antero-posterior diameter of inferior la- 
mella ...... 
.017 
Sixth cervical, length of centrum .... 
.017 
“ “ width across prezygapophyses 
.024 
“ “ antero-posterior diameter of inferior la- 
mella ...... 
.021 
Seventh “ approximate length of centrum 
•0155 
“ “ width across prezygapophyses 
.023 
Fifth dorsal, length of centrum ..... 
.01 1 
Sixth dorsal, “ “ “ 
.or 18 
Tenth 
.013 
Eleventh dorsal, length of centrum .... 
.014 
Twelfth “ 
.0145 
“ “ width of posterior face of centrum 
.0125 
“ “ depth “ “ “ “ “ 
.008 
First lumbar, length of centrum .... 
.017 
“ “ width across prezygapophyses 
.019 
“ “ height, including spine .... 
.023 
Second lumbar, length of centrum .... 
.020 
“ “ width across prezygapophyses . 
.021 
Third lumbar, length of centrum .... 
.021 
“ “ width across prezygapophyses 
.018 
Fourth lumbar, length of centrum .... 
.022 
“ “ width across prezygapophyses . 
.018 
Fifth lumbar, length of centrum .... 
.021 
Sixth lumbar, “ “ “ .... 
.019 
.021 
Sacrum, total length ....... 
.027 
.031 
“ length of centrum of first sacral 
.014 
•015s 
“ “ “ “ “ second sacral 
.013 
.0155 
