194 
PATAGONIAN EXPEDITIONS I PALAEONTOLOGY. 
No. 15,968. 
Metatarsal III, width of trochlea . 
.025 
Metatarsal IV, length ..... 
.076 
“ proximal width 
.023 
“ “ “ thickness 
.027 
“ dist. width of shaft 
.028 
“ width of trochlea . 
.023 
Phalanx I, digit II, length .... 
.020 
“ “ “ proximal width 
.020 
Phalanx 2, “ “ length .... 
.018 
“ “ “ “ proximal width 
.017 
Ungual, “ “ length .... 
.024 
“ “ proximal width 
.016 
Phalanx i, digit III, length .... 
.028 
“ “ “ proximal width 
.026 
Phalanx 2, “ “ length .... 
.023 
“ “ “ proximal width 
.028 
Ungual, “ “ length .... 
•033 
“ “ proximal width 
.026 
“ “ greatest width 
•033 
Phalanx I, digit IV, length .... 
.027 
“ “ “ proximal width 
.024 
Phalanx 2, “ “ length .... 
.021 
“ “ “ “ proximal width . 
.022 
Ungual, “ “ length .... 
.024 
“ “ proximal width 
.018 
“ “ greatest width 
.020 
A comparison of the dimensions of the pes with those of the manus of 
the same individual, as given in the table on p. 191, will show how very 
small the hind-foot is, not only in relation to the fore-foot, but still more 
in proportion to the size of the whole skeleton. 
Localities . — This species is one of the most abundant individually and 
also one of the most widely distributed elements of the Santa Cruz fauna 
and occurs in almost every fossiliferous locality. Skulls, unfortunately 
fragmentary, that cannot be distinguished from N imbricatus , are found 
at Lake Pueyrredon in association with another species, N. cornutus , 
described in a subsequent section. In the region of the plains and the 
Atlantic coast, the typical Santa Cruz beds have yielded a very large 
number of individuals and all of those cited in the preceding pages were 
found on the coast, at Coy Inlet, and 5, 8 and 10 miles south of that 
Inlet. This, however, is a mere accident of preservation, the better 
