230 PATAGONIAN EXPEDITIONS I PAL/EONTOLOGY. 



deeply invaded by the notch from the distal end, while the facet for the 

 navicular is somewhat less deeply concave. The calcaneum has much the 

 same general shape as in H. longiceps, but the tuber is thinner planto- 

 dorsally and is less expanded and rugose at the free, or proximal end ; this 

 difference is especially marked in the younger and smaller individuals ; 

 the position of the two facets for the astragalus and of the cuboid facet 

 differs more or less in every specimen, though they are essentially similar 

 to the corresponding surfaces on the calcaneum of H. longiceps. The 

 remaining bones of the tarsus display no peculiarities that require notice. 



The metatarsals resemble those of the larger species, with the quite 

 constant exception that metatarsals IV and V are shorter in proportion to 

 the length of metatarsal III, and that the latter, though extremely short 

 and heavy, is yet rather less massive. 



The phalanges differ only in size from those of H. longiceps. 



MEASUREMENTS. 



No. No. No. No. No. 



15,011. 15,545- 15,160. 15,507. 15,155- 



Pelvis, length 1 97 .200 



" greatest width 225 .235 



Ilium, length 114 .115 



" greatest width 075 .077 



Ischium, length 083 .085 



Acetabulum, antero-posterior diameter 034 .032 



Femur, length from head .172 



" " " great trochanter .175 



" width of proximal end .063 



" " " distal end over tuberosities . . .054 



" " " " condyles .048 



" " " rotular trochlea .024 



Patella, length .032 .038 



" greatest width .025 .022 



Tibia, length . 1 24 



" width of proximal end -049 .05 1 



" thickness of proximal end -039 .040 .041 



" width of shaft in middle .018 -0175 



" thickness of shaft in middle .015 .015 



" width of distal end .043 



" thickness of distal end .021 .021 



Fibula, length .121 



" width of proximal end .013 



" thickness of proximal end .020 



