BY C. W. DE VIS. 
79 
EXTERNAL LENGTH. INTERNAL LENGTH. 
Least 
Great- 
est. 
Number 
ined. 
]Vl6£tn. 
Least 
Great- 
est. 
Number 
ined 
Mean. 
M. gigantevs 
.. 86*0 . 
..1047 
.. 27 .. 
.97-66 
62 3 . 
. 76-1 
... 27 .. 
. 66-5 
, , Tobustus 
.. 75-5 . 
.. 89 0 
4 
.83 55 
57-3 . 
71-6 
... 4 .. 
. 67*5 
,, rufus 
.. 85-7 . 
.. 97-0 
... 2 . 
. 91-3 
68-5 . 
. 72-7 
., 2 .. 
70-6 
H. parry i 
, , agilis 
.. 61-1 
.. 731 
... 16 . 
. 66-2 
49-4 . 
. 56-6 
.. 16 .. 
. 53-6 
.. 63-2 
.. 78-0 
... 13 . 
. 69-7 
38-0 . 
. 46 4 
.. 13 .. 
. 42-0 
,, ualabatus 
.. 55 0 
.. 63-7 
... 3 . 
. 59-1 
46'3 . 
. 54-8 
.. 3 .. 
49-7 
, , dorsalia 
.. 50-4 
.. 70-0 
... 20 . 
. 58-7 
42-5 . 
. 51-8 
.. 20 .. 
. 46-0 
,, thetidis 
.. 42-5 
.. 49-0 
... 4 . 
. 45-7 
34-6 . 
. 41-0 
.. 4 .. 
. 371 
,, roxeni 
.. 42-2 . 
.. 48-2 
... 6 . 
. 44-5 
34-5 . 
. 38-8 
... 6 .. 
. 36 5 
,, ruficollis 
.. 60-0 
.. 70 8 
... 14 . 
. 65-1 
45-6 . 
. 56-7 
.. 14 .. 
. 51-2 
,, wilcoxi 
.. 44-5 . 
.. 48 0 
... 2 . 
. 46-2 
39 3 . 
. 41-0 
.. 2 .. 
. 40-2 
,, stigmaticus . 
... 1 . 
. 44-6 
.. 1 .. 
. 35 0 
0. frenata 
;• 4i -i . 
" 43-5 
... 3 . 
. 419 
28-5 '. 
'. 36-2 
... 3 .. 
. 32-4 
P. penicillata . 
. 42-2 . 
.. 52 4 
18 . 
. 47-7 
35-5 . 
. 45-8 
.. 17 .. 
. 33-8 
With respect to form and structure, attention has necessarily 
been paid to the shape and sculpture of the several premolars and 
to their periods of rise and fall in terms of the posterior molars : 
to the shape, properties and accessory furniture of the true molars: 
and to the form of the lower contour line of the mandible. 
Occasionally it has been found useful to notice the shape and 
direction of the lower incisor, the condition of the symphysis, the 
level of the inlet of the dental canal, the position of the internal 
orifice of the lachrymal canal, and status of the anteorbital 
foramen. 
A jaw is accounted adolescent in which appears the first trace 
of wear on the hind lobe of the penultimate molar; it is supposed 
to be adult when the same state of wear obtains in the last molar. 
When the posterior surface of an upper molar is excavated 
vertically and the inner lip of the semifuniculate gorge resulting 
is raised, this lip in the antecedent teeth appears as an adpressed 
fold. 
The term link is retained for the longitudinal ridge linking 
together the several lobes, or the front lobes and their respective 
talons; valley is a term convenient in use to indicate the hollows 
which are constant between the lobes and frequent on the talons. 
The qualification elongate applied to molars implies that those 
of the lower jaw are on the average one half longer than broad, 
or thereabouts. 
