SINCLAIR: MARSUPIALIA OF THE SANTA CRUZ BEDS. 



401 



guish A. manzaniaiia from A. niinnta. 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. \ \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. 



Skull, length on median basal line 

 " " premaxillae to condyles 



Skull, greatest width across zygo- 

 matic arches .... 



Skull, width across postorbital proc- 

 esses ...... 



Cranium, length, condyles to anterior 

 border of orbit .... 



Cranium, least width of brain case 



Face, length to anterior border of orbit 



Nasals, length .... 



" width at anterior extremity . 

 " " posterior 



Occiput, height .... 

 " width at base 



Mandible, length, including condyle . 



Mandible, length, M ? to outer end of 

 condyle ..... 



Mandible, height of condyle above 

 angle ...... 



* Width increased by crushing. 



No. 

 15,029. 



.056 

 .0204 



No. 



.070* 



No. 

 Ant. Mus. 

 .108 



.112 

 .062 

 .OI9 



.090 

 .036 

 .0175 



