9 6 
PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 
Munich collection labelled by Ameghino P. ncevius has the mandible less 
thick transversely and the teeth somewhat smaller than in the typical P. 
moycini. Possibly P. nceuius is to be regarded as a distinct species but 
for the present it may be included with P. moycini. 
The following Santa Cruz localities have afforded specimens of the 
latter species, the figures referring in each case to the number of indi- 
viduals : Halliday’s estancia, Rio Gallegos (2), Felton’s estancia, Rio 
Gallegos (10), Rio Gallegos (1), Killik Aike, Rio Gallegos (6), four miles 
east of Killik Aike (1). 
Nos. 15,743, 15,744 and Nos. 9283, 9481, 9242 and 9219 of the 
American Museum collection are figured on the accompanying plates. 
Measurements. 
No. 
No. 
No. 
* 5 , 743 - 
9283. 
9481. 
Skull, maximum length ..... 
.0825 
.0765 
“ greatest width across arches 
.0485 
•0455 
“ interorbital width ..... 
.021 
.0195 
“ height of occiput ..... 
•0135 
“ width “ 
.030 
.0265 
Palate, length along median line from alveolus of 11 
to palato-narial border ..... 
.049 
Palate, width at Ml ...... 
.0165 
Mandible, length including median incisors 
.0665 
.061 
.0666 
“ depth at Po- . 
.0105 
.0105 
.010 
“ “ “ Mg 
.015 
•0135 
•0135 
Upper dentition, length U-M 3 - .... 
.0425 
•039 
“ “ “ P-l-M -1 on alveolar border . 
.0244 
.0227 
“ “ “ M-l-M -1 “ “ “ 
.014 
.0126 
P-, width at alveolar border .... 
.0065 
P- 1 , antero -posterior diameter .... 
.0036 
“ transverse “ .... 
.0022 
PI, antero-posterior “ .... 
.004 
“ transverse “ .... 
.0025 
PI, antero-posterior “ .... 
.0042 
“ transverse “ .... 
.0028 
Ml, antero-posterior “ .... 
M 
i-O 
O 
q 
“ transverse “ .... 
.003 
Ml, antero-posterior “ .... 
.0045 
“ transverse “ .... 
.003 
Ml, antero-posterior “ .... 
.0045 
“ transverse “ .... 
.0025 
