210 PATAGONIAN EXPEDITIONS I PAL/EONTOLOGY. 



MEASUREMENTS. 



Skull, length from orbit to anterior nares .03 1 Palate, width at 012 



" width at postorbital constriction . .033 Mandible, length from condyle 132 



" " over lachrymals 054 " " " angle 134 



Rostrum, width at base 026 " " of predental beak . . . .036 



" " " anterior end 029 " " from condyle to T . .. .059 



Palate, length in median line 054 " height of coronoid 059 



" width at 1 026 " " " condyle 046 



" " " preorbital fossae 024 " depth below ^ 027 



" " " % 014 " thickness below 3 016 



Except for their smaller size, the vertebrae of the various regions are 

 so like those of H. longiceps as to require no particular description. 



The ulna likewise differs but little from that of the last named species ; 

 it is shorter and straighter and the shaft has a relatively greater transverse 

 and smaller antero-posterior diameter, while the facet for the head of the 

 radius is larger and more distinctly demarcated. 



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



The femur, on the other hand, is quite different ; the head is set upon a 

 less constricted neck and presents more obliquely upward, less inward ; the 

 great trochanter is much lower, so that there is no notch between it and 

 the head ; the process, though low, is very heavy and encloses a small, 

 but deep digital fossa ; the second trochanter is much less prominent and 

 more distal in position ; the shaft is notably narrower and less antero-pos- 

 teriorly compressed ; the rotular groove is more concave and has more 

 elevated borders, while the condyles display no noteworthy peculiarities. 



The pes is represented by the calcaneum, navicular, mesocuneiform, 

 metatarsal IV and several phalanges. The calcaneum is quite strikingly 

 different from that of H. longiceps; the tuber is narrower, thicker, less 

 depressed planto-dorsally and more strongly arched, with more concave 

 plantar face; the proximal end is much less expanded and its internal 

 angle is much more thickened ; the process from the fibular side near the 

 distal end is much less prominent and the two facets for the astragalus 

 are farther apart. The other foot-bones require no description. 



MEASUREMENTS. 



Ulna, estimated length 176 Metacarpal II, distal width 012 



" " of olecranon 030 Metacarpal III, length 036 



" width at sigmoid notch 028 " " proximal width 019 



Metacarpal II, length 035 " " distal width 015 



" " proximal width 012 Metacarpal IV, length 044 



