Sinclair: marsupialia of the santa cruz beds. 
401 
guish A. manzaniana from A. miniifa. The species is represented in the 
Princeton collection by remains of three individuals : 
No. 15,148, a fragment of the right maxilla retaining in place the little- 
worn crowns of all the teeth except the canine and median premolar, col- 
lected by Mr. O. A. Peterson from the Lower Santa Cruz beds, ten miles 
south of Coy Inlet. 
No. 15,029, an incomplete skull and mandible obtained by Mr. Hatcher 
from the Lower Santa Cruz beds at the same locality as No. 15,148. 
No. 15,154, a crushed skull, atlas, third cervical and portions of the right 
fore and left hind limbs, collected by Mr. Peterson from the Lower Santa 
Cruz beds, ten miles south of Coy Inlet. 
The collection of the American Museum of Natural History contains a 
remarkably perfect skull associated with a part of the mandible (No. 9254, 
PI. LX, figs. 1-1 c) from the vicinity of Felton’s estancia on the Rio Gallegos. 
The accompanying table of measurements shows considerable individual 
variation in size. This may possibly be a sexual character. 
Measurements. 
No. 
No. 
No. 
No. 9254 
13,148. 
15,02 p. 
15 , 154 - 
Am. Mus. 
Skull, length on median basal line 
CO 
0 
“ “ premaxillae to condyles 
.112 
Skull, greatest width across zygo- 
matic arches .... 
,056 
.070 * 
.062 
Skull, width across postorbital proc- 
esses ...... 
.0204 
.OI9 
Cranium, length, condyles to anterior 
border of orbit .... 
•0755 
Cranium, least width of brain case 
.010 
.010 
.OIO 
Face, length to anterior border of orbit 
.041 
•037 
•039 
Nasals, length .... 
.040 
.038 
■039 
“ width at anterior extremity . 
.0088 
.008 
.OO8 
“ “ “ posterior “ 
.020 
.020 
.018 
Occiput, height .... 
.023 
“ width at base 
.036 
Mandible, length, including condyle . 
.090 
Mandible, length, M^ to outer end of 
condyle ..... 
.036 
Mandible, height of condyle above 
angle ...... 
.0175 
* Width increased by crushing. 
