484 PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 



edly arched in the antero-posterior direction ; the supraorbital border is 

 thin and notched. The face is strongly bent down upon the cranial axis, 

 and the rostrum is relatively short and narrow. The limb bones have 

 already been described. 



In the subjoined table No. 9,539 is a specimen in the collection of the 

 American Museum of Natural History. 



MEASUREMENTS. 



No. No. No. No. 



15,64.8. 15,420. 15,620 0,530. 



Upper dentition, length .041 



" " " pA-m- 3 - 0173 .018 .017 



Upper incisor, width .003 



" " thickness .0042 



PA, length (i. e., antero-posterior diameter) 004 .004 -0035 



" width (i. e., transverse diameter) 004 .004 .004 



Lower dentition, length 039 



" PT-I% 019 



Lower incisor, width 003 



" " thickness 003 5 



Skull, length occipital condyle to pj-, inclusive. . . .049 



" " " m T " ... .045 .052 



Occiput, height 023 .023 



" width at base 028 .029 



Tympanic bulla, length 014 .014 



Skull, interorbital width 024 .024 .021 .022 



Zygomatic arch, length 032 .035 -037 



Rostrum, length .023 



Palate, width at pi 0035 .003 .003 



" " " m 8 - 009 .009 .0095 .o 10 



Mandible, length from condyle 052 



" depth at p*. on 



Atlas, length .on 



width .026 



Axis, length of centrum .012 



" width of anterior face .014 



Last lumbar, length of centrum .016 



" " width of posterior face .013 



Sacrum, width overpleurapophyses .036 



Scapula, length .056 



" width .03 5 



Ilium, greatest width .018 



