148 
MACIlOrODID/E. 
a narrowish naked space 'beneath the nostril, but this does not 
extend back to the posterior angle. The second incisor tooth 
of the upper jaw is rather broader than the first, and the third 
is distinctly tlio broadest, and has a notch behind, marking the 
separation of the posterior lobe from the body of the tooth, and 
is so far back that but a very small portion of the lobe in 
question is visible when the tooth is viewed from the outer 
side. 
Male. 
Female. 
Female. 
Inches. Lines Inches. Lines 
Inches. Line* 
Length from tip of nose to root of tail 
26 
0 
24 
0 
23 
0 
n 
of tail ... ... . 
18 
9 
14 
G 
1G 
3 
tt 
from nose to ear 
4 
3 
3 
9 
3 
11 
a 
of car ... ... . 
2 
3 
2 
0 
1 
10 
a 
of fore-arm, bauds, and nails 
6 
8 
4 
8 
4 
7 
a 
of the nail of middle finger... 
— 
9 
7 
a 
of the tarsus and nails 
G 
C 
5 
4 
5 
G 
«< 
of the nail of the central toe 
l 
2 
— 
10 
<« 
from tip of central toe to the 
apex of that of outer toe ... 
l 
0 
— 
11 
it 
from ditto to the base of nails 
of the inner double toe ... 
L 
7 
1 
3J 
a 
of the three incisors of the 
upper jaw ... . 
— 
6 
In general form, the skull of M. Thetidis nearly resembles 
that of the cranium of M. Ualabatus; the nasal bones, 
however, in the last mentioned animal are less produced in the 
mesial line, behind, and they are broadest at the base, whilst 
in M. Thetidis the nasal bones are nearly of the same width 
from the base to the intermaxillary suture, in front of which 
they ore considerably contracted; the posterior palatine open¬ 
ings arc much larger, and the prcmolars smaller. In the 
skulls of both these animals I have seen the alveoli for small 
canine teeth. 
The following dimensions are from two skulls oiM. Thetidis , 
