Sinclair: typotheria of the santa cruz beds. 
4i 
Specimens referred for the present to P. prcerntilmn have been obtained 
from the following localities: Ten miles south of Coy Inlet (4), Felton’s 
estancia, Rio Gallegos (1), Ilalliday’s estancia, Rio Gallegos (1), Killik 
Aike, Rio Gallegos (2). 
Measurements. 
No. No. 
No. 
/SjS6. 15,161- 
9486. 
Skull, maximum length ....... 
.0925 
“ length, premaxillre to condyle inclusive 
.088 
“ greatest width across arches ..... 
.061 
• 05-45 
“ interorbital width ....... 
.030 
“ least width of brain case ...... 
.020 
“ height of occiput ....... 
•015s 
“ width of occiput ........ 
.046 
Palate, length ......... 
.054 
“ width at posterior margin of M- 2 - ..... 
.0206 
.020 
Mandible, length including Iy ..... 
.082 
“ depth below Py ...... 
.015 
“ “ posterior margin of My 
.023 
Upper dentition, length Ii-M -4 ...... 
•0495 
“ “ “ Pi-M -4 on alveolar border . 
•034 
.0352 
“ “ “ ML-M-2- “ “ “ 
.020 
•0185 
Ii, width .......... 
.0032 
“ greatest transverse diameter ...... 
.0016 
Ii, width .......... 
.0035 
“ greatest transverse diameter ...... 
.002 
C, width .......... 
•0035 
“ greatest transverse diameter ...... 
.002 
PL, antero-posterior diameter just above triturating surface 
.0022 
.0036 
“ transverse diameter in same plane ..... 
.002 
.0025 
Pi, antero-posterior diameter just above triturating surface 
.0035 
.0038 
“ transverse diameter in same plane ..... 
.0025 
.0025 
Pi, antero-posterior diameter just above triturating surface 
.0045 
.0046 
“ transverse diameter in same plane ..... 
.0032 
•0035 
Pi, antero-posterior diameter on triturating surface externally . 
.0042 
.0046 
“ transverse diameter at widest part ..... 
.0035 
•0037 
Mi, antero-posterior diameter on triturating surface externally . 
.0062 
.0066 
“ transverse diameter at widest part ..... 
.0045 
.0045 
Mi, antero-posterior diameter on triturating surface externally . 
.0062 
. .006 
“ transverse diameter at widest part ..... 
.004 
.004 
Mi, antero-posterior diameter on triturating surface externally . 
.0065 
.0061 
“ transverse diameter at widest part ..... 
.0034 
•0035 
Lower dentition, length Iy-My ...... 
.046 
“ “ “ Pj-Mg- on alveolar border . 
•0343 
|oo 
l 
df 
.0194 
