Sinclair: typotheria of the santa cruz beds. 
67 
Sixth lumbar, length of centrum ..... 
Seventh “ “ “ “ 
Pelvis, length ......... 
“ greatest (width of ilium ...... 
“ width of neck of ilium . ... 
“ antero-posterior diameter of acetabulum . 
“ transverse “ “ . 
Femur, transverse diameter proximally .... 
“ “ “ across minor and third trochanters 
Patella, length ........ 
“ width 
No. 
i5,°43 ■ 
.01 1 5 
.01 1 
.069 
.0093 
.008 
.0094 
.0095 
.015 
•0135 
.012 
.0065 
Fig. 13. 
HEGE TO THERIIDAi. 
HEGETOTHERIUM Ameghino. 
(Plates I, II ; Text Figs. I, D ; 4, A ; 13-16.) 
Hegetotherium Amegh. ; Enumeracion Sistematica, etc., p. 14, 1887 
Selatherium Amegh.; Enumeration Synoptique, etc., p. 19, 1894. 
This genus is represented in the collec- 
tions by a single species, Hegetotherium 
mirabile. With the exception of the ver- 
tebral column and ribs, pelvis, scapula 
and fore foot, the skeleton is fairly well 
known. 
Dentition (PI. I, figs. 1, 3, 5-5 b). — In 
Hegetotherium , the median upper incisors 
are enlarged, cropping teeth, growing 
from persistent pulps, with the enamel 
layer confined, as in the Rodentia, to the 
outer side of the crown. The enamel is 
marked by a large number of minute, 
longitudinal, parallel flutings, occasionally 
crossed by growth lines. These teeth 
are implanted obliquely and converge anteriorly (text fig. 13). 
The remaining incisors and the canine are cylindrical, single-rooted 
teeth, separated from each other and from the median incisor by short 
diastemata. The canine may be close to the first premolar, or slightly 
spaced from it, and is implanted entirely in the maxillary. The true shape 
Hegetotherium mirabile , skull from in 
front, xf (No. 1 5,542). 
