276 PATAGONIAN EXPEDITIONS I PALEONTOLOGY. 



with wider and more regularly arched, less sloping dorsal border, and the 

 cleft at the distal end is almost obsolete. 



MEASUREMENTS. 



Radius, length 155 Second phalanx, digit II, prox. width. .012 



" width of proximal end 0235 " " " " " thick- 



" thickness of proximal end ... .018 ness. .017 



width of distal end 0285 " " " distal thick- 



Metatarsal II, length 029 ness. .01 1 



" width of proximal end . .016 Second phalanx, digit III, length 023 



" " distal end 0135 " " " " prox. width .015 



Metatarsal III, length 0265 " " thick- 



" " width of proximal end . .019 ness. .021 



" "distalend 017 " distalthick- 



First phalanx, digit II, length 013 ness 015 



" " proximal width .014 ' Ungual, digit II, length 048 



" " thick- " " " proximal width 0105 



ness. .019 " ' thickness.. .016 



First phalanx, digit III, length 017 Ungual, digit IV, length 044 



" " " " proximal width .016 " " " proximal width 012 



" thick- ' " thickness . .016 



ness. .0215 Digit II, length 095 



Second phalanx, digit II, length 025 



EUCHOLCEOPS CURTUS Ameghino. 



Eucholcaops curtus Amegh. ; Enum. Synopt. des Mamm. Foss. de 

 Patagonie; 1894, p. 154. 



For the present, at least, it is desirable to keep this species distinct, for 

 the type and only known specimen is a very curious skull, remarkable for 

 its shortness and great breadth. To a certain extent, this shortness is 

 more apparent than real, for the skull has been " telescoped " by a longi- 

 tudinal compression, but even after making due allowance for this, the 

 proportions remain very unusual. 



The dentition does not differ from that of E. fronto, more than the 

 teeth of various individuals of the latter differ from one another, and the 

 peculiarities of the skull are best indicated in the measurements. 



MEASUREMENTS. 



Upper dentition, length 056 - 2 -, length 0045 



1-A 028 " width 009 



*, length (i.e., antero-posterior diameter) .009 &, length 005 



" width (i. e., transverse diameter) 008 " width 009 



