236 PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 



MEASUREMENTS. 



Femur, length from head 190 Tibia, thickness of distal end 023 



" " " great trochanter . .187 Calcaneum, length 065 



" width of proximal end 071 width of proximal end 053 



< " distal end over tuber- " " at constriction 020 



osities 065 " " of distal end 025 



" " distal end overcondyles .054 Metatarsal III, length 027 



Patella, length 039 " " proximal width 019 



" greatest width 029 " " distal width 017 



Tibia, length 140 " " distal thickness 0235 



" width of proximal end 055 Metatarsal V, length 035 



" thickness of proximal end 043 " " proximal width 033 



" width of shaft in middle 020 " " " thickness 015 



" thickness of shaft in middle 019 " " distal width oio 



width of distal end 046 " " thickness 012 



? HAPALOPS PONDEROSUS, sp. nov. 



(Plate LIV, Figs. 2, 2.) 



A large species which may perhaps be referable to Hyperleptiis rather 

 than to Hapalops, but the median notch of the palate which receives the 

 premaxillary spines would seem to indicate that the premaxillae had the 

 shape chararteristic of the present genus. 



The type specimen (Princeton Museum, No. 15,520) consists of the 

 skull, without mandible, humerus, femur, proximal half of the tibia, and 

 the calcaneum ; it was collected by Mr. Hatcher, probably at Corriken 

 Aike. 



The first upper tooth is small, of longitudinally oval section and abraded 

 almost horizontally. The molariform teeth are unusually large and rect- 

 angular, not quite like those of any other specimen ; - is of almost square 

 section ; - is a transverse rectangle and the largest of the series ; - is simi- 

 lar, but a little smaller, while - is much reduced in size. The two series 

 of molariform teeth are almost exactly parallel, making the palate of uni- 

 form width between them. 



MEASUREMENTS. 



Upper dentition, length 062 ^, length 009 



" " " 4-6- 041 " width 0115 



J-, length (i. e., antero-posterior diameter). .007 A , length 008 



" width (i. e., transverse diameter) 006 " width 01 1 



i, length 008 , length 006 



" width oio " width 009 



