SINCLAIR I MARSUPIALIA OF THE SANTA CRUZ BEDS. 405 



podial and part of the patella, collected by Mr. Hatcher, from the Lower 

 Santa Cruz beds at Killik Aike. 



Although smaller than A. manzaniana, the length of the upper pre- 

 molar-molar series is almost the same as in some individuals of that 

 species (cf. PI. LIX, figs, i, 3^). In A. minuta, the nasals are less 

 rounded posteriorly than in A. manzaniana and receive a somewhat 

 longer tongue of the frontals between them. This, however, may be an 

 individual rather than a specific character. In the mandible, the chin is 

 more strongly marked than in A. manzaniana. The dental pattern is 

 identical in the two species. 



MEASUREMENTS. 



Skull, length from ant. surface of canine to post, border of preglenoid process. .069 



" least width of brain case . . . . . . . . . .010 



" width across postorbital processes ....... .015 



" width across posterior expansion of nasals. . . . . . .015 



Palate, greatest length from anterior surface of canine to palato-narial border. .043 



" width between anterior premolars ....... .009 



last molars 020 



Mandible, length, base of median incisor to condyle ..... .076 



" " M^ to outer end of condyle ..... .0295 



" height of condyle above angle . . . . . . -O'35 



" depth of horizontal ramus below M T . . . . .0105 



" " " " , " " posterior premolar . . . .008 



" " " " " " anterior premolar . . .0078 



" transverse diameter of condyle .... .009 



Upper dentition, anterior border of canine to My inclusive . .044 



" " length of space occupied by premolars . . .017 



" " " " " " " molars ..... .020 



Lower " base of median incisor to M j inclusive . . .048 



" " length of space occupied by premolars . . .017 



" " " " " " molars 0233 



Upper canine, antero-posterior diameter at alveolar border . .0045 



" transverse " " " " -O3 



Anterior superior premolar, antero-posterior diameter .004 



" " " transverse "... .0018 



Median " " antero-posterior 



" " " transverse . -2 



Posterior " " antero-posterior 



" " " transverse . .0025 



Mi, antero-posterior diameter . 

 " transverse " 



, antero-posterior 



transverse " 5 



