Sinclair: marsupialia of the santa cruz beds. 
39i 
Metacarpal II, width of distal end . 
“ III, length 
“ “ width of proximal end 
“ “ “ “ distal end . 
“ IV, length 
“ “ width of distal end . 
“ V, approximate length . 
Terminal phalanx of pollex, approximate length 
Length of calcaneum 
Metatarsal II, approximate length 
“ width of proximal end (approximate) 
“ “ “ “ distal end 
“ III, approximate length . 
“ “ width of proximal end 
“ IV, width of proximal end 
<< y << << ti n 
.006 
.021 
.0045 
.0045 
.020 
.005 
.013 
.009 
.0226 
.027 
.0036 
.0062 
.028 
.0047 
.0045 
.005 
Cladosictis petersoni sp. nov. 
(Plates LIII, Figs. 3, 3 a; LIV, Figs. 1, 10; LV, Figs. 2-3 a ; LVII, Figs. 2, 2a, 4, 4 a; 
LVIII, Figs. 5 , 7-9.) 
The type of this species (No. 15,702 Princeton University Museum) is 
the facial half of a skull associated with a large part of the skeleton, col- 
lected from the Santa Cruz beds ten miles south of Coy Inlet by Mr. 
Peterson, in whose honor the species is named. 
The skeletal material associated with the skull includes the right 
scapula, humerus, radius and ulna, the left femur, tibia, fibula and astrag- 
alus, the atlas, three dorsals, six lumbars, the first sacral and the pelvis. 
Cladosictis petersoni may be recognized by its large size, exceeding in 
this respect the largest and most robust individuals of C. lustratus . The 
face is relatively shorter, and much deeper, than in that species and the 
upper margin of the facial profile is inclined forward more abruptly. The 
sagittal crest rises high above the interorbital tract. This portion of the 
skull has been crushed antero-posteriorly, approximating the origin of the 
crest and the posterior border of the nasals to a greater extent than is 
normal. The arches are more abruptly expanded than in C. lustratus. 
The median and posterior premolars are spaced to a greater extent than 
in the latter, but otherwise there is no difference in the dentition of the 
two species. 
The skeleton of C. petersoni presents no characters, apart from size, by 
which it may be distinguished from C. lustratus. 
