382 PATAGONIAN EXPEDITIONS! PALAEONTOLOGY. 



Among the latter we find some indication of two types of skull, as was 

 pointed out in the generic description. In one (PI. LXIV, fig. i) the 

 skull is narrow and the snout is upcurved in a most curious fashion, being 

 continued well in advance of the incisors and making the upper contour 

 of the face strongly concave. The other skull (fig. 2) is broader, heavier, 

 with nearly straight facial contours and, apparently, no great prolongation 

 of the snout. The difficulty of determining whether these skulls are really 

 as different as, at first sight, they seem to be, lies in the fact that the first 

 has suffered hardly any distortion, while the second has been crushed ver- 

 tically and the tip of the snout is somewhat broken. 



All the individuals agree well in size and indicate an animal of about 

 the same size as Chrysochloris mllosa. 



MEASUREMENTS. 



No. No. No. 

 15,065. 15,384. 13,699. 



Upper dentition, length o 1 8 .017 



" " " of incisor series 003 5 .004 



" " " canine to m-S. 0125 .01 1 



" " " of premolar series 0055 -0055 



" " " of molar series OO35 .003 



Upper canine, antero-posterior diameter at base 0025 .002 



" " transverse " ooi 5 



Lower dentition, length of incisor series .003 



" " " canine to mj 014 .0125 



" " " of premolar series 0055 .0053 OO SS 



" " " of molar series 004 .0033 



Lower canine, antero-posterior diameter 002 .002 .002 



" " transverse " ooi 5 .001 



Occiput, width at base 020 .020 



Skull, length to Ji 03 5 



" interorbital width o 1 2 



" length, orbit to end of rostrum. 



" " " " jl 016 



Zygomatic arch, length 0125 



Palate, length 016 



" width outside of p on 



" "ml 012 



Mandible, length from condyle to canine 024 .0225 



" " " angle to canine 0205 .0195 



" depth at p^ 003 5 .003 



Last seven trunk vertebrae, length .028 



