SINCLAIR: MARSUPIALIA OF THE SANTA CRUZ BEDS. 403 



No. No. No. No. 9254. 



15,14.8. 15,029. 15,154. Am. Mus. 



MA, antero-posterior diameter . . .0028 .0028 .0028 .0023 



" transverse diameter . . . .0072 .007 .0065 .006 



Lower lateral incisor, width of crown .0018 



Lower canine, antero-posterior diam- 

 eter at alveolar border . . . .0046 



Lower canine, transverse diameter at 



alveolar border .... -0035 



Anterior inferior premolar, antero-pos- 

 terior diameter .... .0045 



Anterior inferior premolar, transverse 



diameter ..... .002 



Median inferior premolar, antero-pos- 

 terior diameter .... .006 



Median inferior premolar, transverse 



diameter ..... .0022 



Posterior inferior premolar, antero- 

 posterior diameter . . . .0065 



Posterior inferior premolar, transverse 



diameter ..... .0026 



M-j, antero-posterior diameter . . .006 



" transverse diameter . . . .0027 



Mj, antero-posterior diameter . . .0068 



" transverse diameter . . . -0035 



M ff , antero-posterior diameter . . -0075 .0066 



" transverse diameter . . . .0038 -0033 



M ? , antero-posterior diameter . . .007 .006 



" transverse diameter . . . .004 .003 



Atlas, transverse breadth . .043 



" width of neural arch . . -Oio 



" " intercentrum . .0056 



Third cervical, length of centrum . -O'SS 



" " width across trans- 

 verse processes .... -028 



The following measurements of the manus and pes are from No. 15, 154 : 



Metacarpal II, length ... - 1 SS 



" " width of proximal end . . .0045 



" distal " . -0055 



Metacarpal III, length 



" " width of proximal end . . .004 



" " " " distal end ... . -O5 



Metacarpal IV, length ... -O l8 



" " width of proximal end . . . .0036 



