BY C. W. DE VIS. 
77 
intention to throw the .sexes into separate tables was abandoned 
when it was found that although the mean size is less in the 
female than in the male, individual exceptions are so frequent 
and pronounced that such separation would afford no guidance in 
an attempt to discriminate between the sexes of the fossils. 
All measurements are in millimetres. 
LENGTH OF CHEEK TEETH. 
ADULT MANDIBLE. ADULT MAXILLA. 
Least. 
Great- 
est. 
Number 
Mea- 
Mean. 
Least. 
Great- 
est. 
Number 
Mea- 
Mean. 
sured. 
sured. 
M. giganteus 
... 1 .. 
48'5 
48-1 . 
. 50-7 
.. 3 . 
. 49 2 
, , robustus 
... 1 .. 
47-4 
39-7 . 
. 53'3 
.. 4 .. 
. 47-0 
,, rufiis _ 
H. parryi 
30-5 
37-5 
16 
35 9 
37-8 '. 
. 41-5 
16 
'. 39-0 
, , agilis 
. 36-0 . 
.. 43 5 
.. 13 .. 
39-9 
40 4 
.. 47-2 
.. 13 .. 
. 43-7 
, , ualabatus 
.. 34 5 
.. 40-0 
... 2 .. 
37 2 
37-0 . 
. 42-0 
.. 3 .. 
. 38-8 
,, dor ml is 
. 29 
.. 35 3 
.. 20 .. 
32-0 
33 0 . 
. 377 
.. 17 .. 
. 35 2 
,, ruficollis 
.. 25 5 . 
.. 37-5 
.. 13 .. 
34-8 
36-0 . 
. 40-7 
.. 14 .. 
. 38-7 
wilcoxi 
.. 30 0 
. 31-0 
.. 2 .. 
30-5 
313 . 
. 31-4 
.. 2 .. 
. 31-35 
,, stigmaticus . 
.. 1 .. 
29-5 
.. 1 .. 
. 316 
,, coxeni 
29-2 . 
.'. 32 0 
.. 6 .. 
30-4 
29-2 '. 
. 32-6 
.. 5 .. 
. 31-8 
, , thetidis 
.. 29-0 . 
.. 30-5 
.. 4 .. 
30 2 
29-0 . 
. 31-0 
.. 4 . 
30-2 
0. frenata 
.. 18 0 . 
.. 23 0 
.. 3 .. 
20-8 
25-7 . 
. 34-5 
.. 2 .. 
. 30-1 
P. penicittata . 
.. 28-5 . 
.. 31-7 
.. 17 .. 
30-0 
27-5 . 
. 34-5 
.. 17 .. 
. 32-6 
WIDTH OF FORE LOBE OF M.3 
LOWER. 
UPPER. 
M. giganteus 
. 6-9 .. 
. 8-9 . 
. 44 .. 
. 7-6 
7-7 . 
. 10-2 ... 
41 . 
.. 8-7 
,, robustus 
. 70.. 
. 8-0 . 
. 9 .. 
. 7-6 
7'0 . 
. 9 0... 
17 . 
. 8-0 
,, rufiis 
. 8-0 .. 
. 8-5 . 
4 .. 
. 8-2 
9-9 . 
. 10 5 ... 
5 . 
.. 10-1 
H. parryi ' . 
. 5 4.. 
. 69 . 
. 38 .. 
. 5-9 
6-1 . 
. 7-6 ... 
36 . 
. 7-0 
,, agilis 
. 5-7 .. 
. 7-2 . 
. 19 .. 
. 64 
7-1 . 
. 8-6 ... 
19 . 
. 7'8 
,, ualabatus 
. 6 0 . 
. 71 . 
. 5 .. 
. 6-4 
7'1 . 
. 9 2 :.. 
5 . 
. 7-8 
dorsalis 
. 4-9 .. 
60 .. 
. 41 .. 
. 5-1 
60 . 
. 7-3... 
39 . 
. 6-7 
,, thetidis 
. 44 .. 
. 5-4 . 
. 13 .. 
49 
5 6 . 
. 6 5 ... 
10 . 
. 5-9 
,, coxeni 
. 4-5 .. 
50 .. 
. 7 .. 
. 4-8 
55 .. 
. 6-5 ... 
7 . 
. 6-3 
,, ruficollis 
. 5'7 .. 
7 2 .. 
. 31 .. 
. 6-3 
6-5 .. 
. 8-9 ... 
34 . 
. 7*5 
,, wilcoxi 
. 4-6 .. 
46 .. 
. 2 .. 
. 46 
5-5 .. 
. 6-2 ... 
2 . 
. 59 
,, stigmaticus . 
. 4-7 .. 
4-9 . 
. 2 .. 
. 4-8 
5-9 .. 
. 6-1 ... 
2 . 
. 6-0 
O. frenata 
. 4-1 .. 
. 43 . 
2 
. 4-2 
5-5 .. 
6-3 ... 
2 . 
. 5-9 
P. penicittata . 
. 4-5.. 
. 5-5 . 
. 44 .. 
. 4-9 
56 . 
. 6-8... 
41 . 
. 6-5 
