238 PATAGONIAN EXPEDITIONS I PALEONTOLOGY. 



The femur also is very like that of H. longiceps in size and proportions ; 

 the head is somewhat larger and the pit for the round ligament is of more 

 pyriform shape, its apex extending to the hinder margin of the articular 

 surface. The great trochanter is relatively higher, making deeper the 

 notch between itself and the head ; the digital fossa is larger and deeper, 

 more so than in any other specimen in the collection ; the third trochanter 

 has about the same relative position as in H. longiceps, but projects more 

 prominently and is narrower proximo-distally. The shaft is broader, 

 especially its proximal portion. The rotular groove is broad and shallow, 

 with raised internal border, while the tuberosities are unusually large and 

 rugose. 



In the tibia, so far as it is preserved, the only noteworthy difference 

 from that of H. longiceps is the greater slenderness of the shaft. 



The calcaneum resembles that of the last named species ; the proximal 

 end of the tuber is more expanded and less oblique, making the lateral 

 borders more concave; the external astragalar facet is larger, and the 

 projection from the outer side of the distal end more prominent. 



MEASUREMENTS. 



Humerus, length 1 94 Femur, width of distal end over tuber- 



" width of distal end over epi- osities 078 



condyles 075 " " " rotular groove 032 



" " " " trochlea 041 Tibia, width of proximal end 072 



Femur, length from head 216 " thickness of proximal end 051 



" " " great trochanter . . .219 Calcaneum, length 076 



" width of proximal end 090 " width of proximal end 066 



" " " shaft above second tro- " " at constriction 023 



chanter 070 " " of distal end 032 



" " " distal end over condyles .069 



HAPALOPS INFERNALIS Ameghino. 



Eucholceops infernalis Amegh. ; Enumeracion sistem., etc., 1887, p. 21. 

 Pseudhapalops infernalis Lydekker; Anales del Museo de La Plata, T. 



Ill, 1894, p. 103. 



As Lydekker has pointed out (loc. cit), this species is not referable to 

 Eucholceops. Unfortunately, the type specimen, the anterior part of a skull, 

 is in a much damaged condition, but apparently indicates a species dif- 

 ferent from any of the preceding representatives of Hapalops. The upper 



