25<3 
PERISSODACTYLA. 
and the third superior premolar are marked with a continuous cingulum on 
the front, inner, and posterior aspects of the base of the crown. There is 
a distinct cingulum on the external base also, but it is interrupted between 
the bases’of the external cusps. The anterior ridge connecting the inner 
with the outer cusps in the third premolar is modified into a stout, low 
tubercle. In the inferior molars, the inner anterior tubercle is stouter and 
more elevated than the others, and is connected with the outer anterior by 
an elevated yoke. In this point it is quite different from the 0. cristonense. 
In this specimen, the heel of the last inferior molar is unusually small. In 
the molars of both jaws, the enamel is rather rugose, except on prominent 
' surfaces, where it is smooth. 
In the femur, tibia, and humerus, the absence of lateral curvatures is a 
noteworthy feature. 
Measurements. 
Length of the superior true molars. 
Length of the last superior molar..... 
Length of the penultimate molar ...... 
Width of the same... 
Elevation of the same... 
Length of the third premolar. 
Width of the same... 
Length of the penultimate lower molar. 
Width of the same. 
Length of the third lower molar..... 
Width of the same..'. 
Length of the femur from the little trochanter.. 
Antero posterior diameter of the femur at the same.. 
Transverse diameter at the middle of the shaft. 
Transverse diameter of the head.. 
Transverse diameter at the condyles... 
Antero-posterior diameter at the condyles... 
Transverse diameter of the tibia at the middle.. 
Transverse diameter of the humerus at the middle .. 
Transverse diameter of the trochlear surface of the humerus. 
Transverse diameter of the head and deltoid crest of the humerus 
Transverse diameter of the head of the radius . .... 
Transverse diameter of the distal end of the radius. 
Vertical diameter of the distal end of the radius ... 
Transverse diameter of the distal end of the tibia. 
Antero-posterior diameter of the distal end of the tibia. 
Length of calcaneum from the front of the inner tuberosity. 
Depth of the shaft of the calcaneum. . 
M. 
0. 023 
0. 007 
0. 008 
0. 010 
0. 006 
0. 0064 
0. 0070 
0.0084 
0. 0055 
0. 010 
0. 006 
0. 077 
0. 011 
0. 010 
0. on 
0.021 
0. 023 
0. 009 
0. 008 
0.012 
0. 021 
0. on 
0.010 
0. 006 
0.012 
0. 009 
0.027 
0. 0085 
