Sinclair: typotheria of the santa cruz beds. 65 
No. 
No. 
15,04-1. 
15,666. 
P- width of crown at cutting edge ....... 
.005 
.005 
J2. i> “ << “ 
l i 
.003 
.003 
C, antero-posterior diameter ........ 
.0017 
“ transverse 
“ ........ 
.001 
Pi, antero-posterior 
“ just above triturating surface 
.0024 
.0021 
“ transverse 
“ in same plane ..... 
.0015 
.0015 
F-, antero-posterior 
“ jusf above triturating surface 
•0035 
.003 
“ transverse 
“ in same plane ..... 
.0025 
.0025 
Pi, antero-posterior 
“ on triturating surface externally 
.004 
.004 
“ transverse 
“ at widest part ..... 
.0035 
.0032 
Pi, antero-posterior 
“ on triturating surface externally 
.0043 
.0045 
“ transverse 
“ at widest part ..... 
.004 
.004 
Mi, antero-posterior 
“ on triturating surface externally 
.0048 
.0052 
“ transverse 
“ at widest part ..... 
.0045 
.0045 
Mi, antero-posterior 
“ on triturating surface externally 
.0045 
.0048 
“ transverse 
“ at widest part ..... 
.004 
.0042 
Mi, antero-posterior 
“ on triturating surface externally 
.005 
.0055 
“ transverse 
“ at widest part ..... 
•0035 
•0035 
Atlas, greatest width across transverse processes. .... 
.028 
“ width across anterior articular surfaces ..... 
.017 
“ “ of neural arch ........ 
.0073 
“ “ “ inferior arch ........ 
.0055 
Axis, length including odontoid ....... 
.017 
Pelvis, length 
.081 
Femur, length 
.063 
Tibia, length 
.068 
Astragalus, length 
.0115 
Calcaneum, length 
.0195 
Metacarpal II, greatest length ....... 
•oi 35 
“ III, length 
.0158 
IV, “ 
6 
.013 
Metatarsal II, “ 
dorsally ....... 
.017 
“ III, “ 
.0208 
“ iv, “ 
“ 
.0202 
“ V, “ 
“ 
.016 
Interatherium excavatum (Ameghino). 
(Pis. VIII, Fig. 28, Text Fig. 12.) 
Icochilus excavatus Amegh. ; Contrib. al Conoc., etc., pp. 472-473, PI. 15, 
figs. 10-13, 1889. 
This species may be readily recognized by the lyrate temporal ridges 
(text fig. 12). A photograph of a specimen in the collection of Dr. 
