SCOTT: TOXODONTA OF THE SANTA CRUZ BEDS. 
225 
No. I 5 J 59 ■ 
No. 15,945. No. 16,011. 
No. 1 5, 1 1 4. 
Di-, length ...... 
• -0055 
•0055 
.006 
“width 
.008 
.008 
.010 
Di 5 -, length ...... 
. .005 
.005 
.0045 
“ width ...... 
.004 
.003 
.003 
Upper milk-canine, length. 
.0065 
.006 
.0066 
“ “ “ width 
.005 
•0035 
.0036 
Upper milk-premolar series, length 
• -0455 
.051 
•045 
Dp-, length ...... 
.008 
.009 
.009 
“ width ...... 
.005 
.005 
•0055 
Dp-, length 
.012 
.Oil 
.0103 
“ width ...... 
. .0095 
.009 
.009 
.0095 
Dp-, length ...... 
• -oi 35 
.017 
.0155 
.014 
“ width ...... 
.012 
.012 
.Oil 
.012 
Dp-, length ...... 
.017 
.019 
.018 
.017 
“ width ...... 
. .015 
•oi 35 
•0135 
.014 
M-, length ...... 
.021 
.0215 
.0205 
“ width 
. .0145 
.012 
.0125 
.013 
Of these four specimens, No. 16,011 
is the 
youngest and in it 
m-, though almost fully erupted, 
shows no 
signs of 
wear ; next 
in point 
of age comes No. 15,945, in which the foremost part of m 1 is somewhat 
abraded, while in' No. 15,1 14 this tooth was in full use and is considerably 
worn. No. 15,159 is the oldest of the series. The dimensions of 
the lower milk teeth are all taken from a single individual, No. 15,159, in 
which m T is in quite an advanced stage of wear. 
Lower milk-dentition, length . . .073 Dp T , length 
006 
Dif, length. .... 
. .004 
“ width. 
004 
“ width ..... 
. .007 
Dp^, length 
0105 
Dij, length. .... 
• -0035 
“ width. 
006 
“ width ..... 
. .0095 
Dps, length 
013 
Dig, length 
. .004 
“ width. 
0065 
“ width ..... 
. .008 
Dpj, length 
015 
Lower milk-canine, length . 
. .0075 
“ width. 
007 
“ “ “ width . 
. .003 
M-j, length 
017 
Lower milk-premolar series, length 
. .0445 
“ width . 
0075 
From the considerable number of skulls which are probably referable to 
this species it is necessary to make a selection for measuring and 
the choice is made so as to display the different proportions which 
are believed to characterize the two sexes and also to bring out the range 
of individual variation in size. Nos. 15,003 and 15,131 are presumably 
females, while the others are supposedly males with frontal horn. 
