SINCLAIR: MARSUPIALIA OF THE SANTA CRUZ BEDS. 389 



No. 15,04.6. No. 75,770. 



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 . . . -O44 

 " " 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 . .... -OI75 



" " 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 . - ! 55 



" " width across prezygapophyses . . .023 



Fifth dorsal, length of centrum . . . . . .on 



Sixth dorsal, " " " 0118 



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 .... .025 



Second lumbar, length of centrum .... -O2O 



" " width across prezygapophyses . . .021 



Third lumbar, length of centrum ... .021 



" " width across prezygapophyses . .018 



Fourth lumbar, length of centrum . . . -O22 



" " width across prezygapophyses . . .018 



Fifth lumbar, length of centrum ... .021 



Sixth lumbar, " ... .019 .021 



Sacrum, total length .... .027 .03 1 



" length of centrum of first sacral . . . .014 -OI55 



" " " " " second sacral . . .013 



