214 



PATAGONIAN EXPEDITIONS I PALEONTOLOGY. 



The cranium is long and very broad and has but a feebly marked postor- 

 bital constriction ; the extent to which the supraoccipital is reflected over 

 upon the roof of the skull cannot be clearly determined, but it would ap- 

 pear to be much less than in most species of Hapalops and more as in 

 Eucholozops. Another resemblance to the latter is to be found, appar- 

 ently, in the greater distinctness of the occipital crest, though the skull is 

 so damaged in this region that it is difficult to interpret. The rostrum is 

 short and very broad and has deep preorbital fossas, and the nasals are 



FIG. 32. 



Type of Hapalops (Tapinotherium) aguirrei, xf. La Plata Museum. 



short and very broad. The palate is but moderately convex between the 

 molariform teeth, less so than in most species of the present genus, and 

 its anterior median notch for the premaxillary spines is a deep, very widely 

 open V, which indicates that the premaxillae had a distinctive shape. 



MEASUREMENTS. 



Skull, length in median basal line 150 Rostrum, length (exclusive of premaxillas) .040 



" extreme length 186 Palate, length in median line 059 



" width at postorbital constriction. .049 " width at 1 035 



Rostrum, width at anterior end 054 " " " & 020 



HAPALOPS BRACHYCEPHALUS Ameghino. 



(Plates XXXV, XXXVI.) 



Hapalops brachycephalus Amegh.; fenum. Synopt. d. Mamm. Foss. de 



Patagonie, 1894, p. 146. 



This appears to be a relatively well-defined species and to it are here 

 referred a skull (No. 15,596) in the Princeton collection, which agrees 



