SINCLAIR: MARSUPIALIA OF THE SANTA CRUZ BEDS. 391 



Metacarpal II, width of distal end 006 



III, length 021 



" width of proximal end ....... .0345 



" " distal end . . . .0045 



IV, length .020 



" width of distal end 005 



V, approximate length . . . . . ... . .013 



Terminal phalanx of pollex, approximate length ..... .009 



Length of calcaneum ...... ... .0226 



Metatarsal II, approximate length ........ .027 



" width of proximal end (approximate) ..... .0036 



" " " distal end .0062 



III, approximate length ........ .028 



" width of proximal end ....... .0047 



IV, width of proximal end ....... .0045 



" V, " " " " . .005 



CLADOSICTIS PETERSONI sp. nov. 



(Plates LIII, Figs. 3, 3 ; LIV, Figs. I, 10; LV, Figs. 2-3* ; LVII, Figs. 2, 2a, 4, 4 ; 



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. lustratits. 

 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. 



