SINCLAIR: MARSUPIALIA OF THE SANTA CRUZ BEDS. 361 



Palate, width between canines . . . . . . . . .024 



" "MA 065 



" length from root of median incisor to palato-narial border . . .092 



Nasals, length ........... .061 



" width at anterior extremity ........ .0145 



" " " posterior expansion ........ .049 



Upper dentition, length from median incisor to M . . . . . .100 



" " " of space occupied by premolars .... .027 



" " " " " " " molars 043 



Median incisor, width of crown . . . . . . . . .0026 



Lateral .<<<<< 003 



Upper canine, antero-posterior diameter at alveolar border . . . . -0145 



" " transverse " " " " oio 



" " length of crown ......... .027 



Anterior premolar, antero-posterior diameter ...... .008 



" " transverse " ...... .004 



Median " antero-posterior " ...... .009 



" " transverse " at widest part . . . .005 



Posterior " antero-posterior " . . . . . . . .0107 



" " transverse " at widest part . . . .0085 



Ml, antero-posterior diameter . . . . . . . . . .oil 



" transverse " 008 



M^, antero-posterior " . . . . . . . . . . .0125 



" transverse ".......... .0083 



M^, antero-posterior ".......... .014 



" transverse ".......... .on 



MA, antero-posterior ".......... .006 



" transverse ".......... .008 



Atlas, transverse breadth across anterior cotyles ..... .043 



" width of neural arch ......... .017 



" " " intercentrum including median process . . . . .0115 



Axis, length of centrum including odontoid ...... .045 



" " " odontoid 0096 



" width over anterior cotyles . . . . . . . . .0346 



" height of neural spine above centrum ...... -0345 



Third cervical, length of centrum ........ .0213 



width across transverse processes ..... .046 



" height of neural spine above centrum ..... -0255 



Fourth " length of centrum ........ .0205 



" " width across transverse processes ..... .044 



" " height of neural spine above centrum . . . .023 



Fifth " length of centrum .021 



" " width across transverse processes .... .043 



Sternal segments, average length ........ -0305 



