SCOTT : ENTELONYCHIA OF THE SANTA 
CRUZ BEDS. 
283 
Type. 
No. X. 
No. 15,406. 
M-, length ..... 
• -039 
•0445 
.039 
“ width ..... 
. .042 
.049 
.041 
M-, length ..... 
•0525 
.049 
“ width ..... 
•054 
.047 
M-, length ..... 
.056 
.047 
“ width ..... 
.051 
•045 
No. Y. 
No. 16,015. 
Lower dentition, length C to nif, inch 
. .207 
.221 
Lower canine, length 
. .022 
.018 
“ width 
. .017 
.021 
Lower cheek-teeth series, length 
• -195 
.1845 
Lower premolar series, length . 
. .089 
.085 
P r , length 
. .020 
.0 16 
.018 
“ width ..... 
. .017 
.019 
.016 
Pg-, length ..... 
. .021 
.0195 
.0205 
“ width ..... 
. .019 
.020 
.015 
P3 , length 
. .024 
.0245 
“ width ..... 
. .019 
.023 
.017 
Pj, length ..... 
. .027 
.026 
“ width 7 
. .022 
.026 
Lower molar series, length 
. .108 
•0995 
My, length ..... 
. .034 
.028 
“ width ..... 
. .024 
.022 
M-g-, length ..... 
. .040 
•0325 
“ width ..... 
. .026 
.023 
Mg, length 
. .044 
.041 
“ width ..... 
. .024 
.025 
In this table the measurements of the type are taken from Flower’s 
plate, but there is some inaccuracy involved, for the side and crown views 
do not exactly agree in size. No. X is a palate in the La Plata Museum 
and No. Y a mandible in the Ameghino collection ; in both instances the 
dimensions are from photographs which I made and are therefore not 
exact, but the error is probably small. No. X is a somewhat older animal 
than the type-specimen and No. Y is a very old individual with teeth 
much worn down. The table illustrates the tendency of the grinding 
teeth to shorten in antero-posterior length with advancing age. 
The isolated ulna (No. 15,747), described in a preceding page, has the 
following dimensions : 
Ulna, length. ..... .585 Ulna, prox. width at radial facet. . .081 
“ of olecranon . . . .128 “ distal width .... .0655 
“ width of coron. process . . .054 “ “ “ of styloid process . .035 
