The following are the measurements of this female
Tip of muzzle to root o f tail along side . . . . . . . .
Length o f the tail ' . •
„ of hand to tip of middle finger . . • •
„ of foot to tip o f middle toe ........................................ .........
Breadth between inner angles o f eyes • • • • ‘ • "■ *
„ - across outer a n g l e s .............................................................. ' ;
The accompanying figures (figs. 7 and 8) of the skull, reduced to three-fourths
j ig . 7 .—Lateral view of the skull of the Irawady monkey ( ? ) M. assamensis.
Fig. 8.—Upper view of the same skull as fig. 7.
natural size, will exemplify its characters,, while the column of measurements,
alongside of which I have given the corresponding dimensions of a ferine individual
of the same sex of M. rhesus, will illustrate wherein the two appear to differ,
but as there are not sufficient materials wherewith to generalise, these must be
regarded more as a record of facts to aid further research than as an attempt to
draw any rigid line between the two species.
The characters of the pelvis of this thoroughly ferine example of this species
are worthy of being noted in view of Dr. Murie’s remarks on the pelvis of the
female of M. cyclopis. The pseudo-sacral vertebra and the first caudal are in the
same plane with the sacrum, and from the uptilting characterising them and the
sacrum more capacity is conferred on the cavity of the pelvis than in M. cyclopis.
The bone anterior to and behind the thyroid foramen is thin and transparent, but of
great hardness, and thus contrasts much with the generally thickened and opaque
character of these parts in monkeys kept in confinement, and on what is so marked
a feature in the pelvis of M. cyclopis. The vertebrae and all the long bones correspond
to those of M. rhesus. The manubrium also has the same form as in
the latter monkey, but there are only five sternal pieces behind it.
Measurements of skulls of the Irawady Monkey ? , and of M. rhesus $ , and
M. rhesus % :
Anterior border of occipital foramen to tip of premaxillaries
Greatest length from occipital to tip o f premaxillaries
Occipital ridge to nasal process o f frontal . . . . .
Anterior margin of auditory openings to tip of premaxillaries
Breadth between auditory o p e n i n g s ...........................................................
Greatest breadth behind root of zygoma . . . . .
„ facial breadth across fronto-malar suture . . . .
Anterior margin of occipital foramen to posterior border of mesial line of
palate . . • •
End of pwemaxilla to nasal process o f frontal . . . . .
Breadth o f temporal fossa behind tempero-malar suture '.
„ across zygomatic arch . . . . .
„ . • of muzzle at base of last tooth . . . . .
„ . of muzzle at first bicuspid ...........................................................
Height of orbit . . . • . . . . .
Diameter o f orbit . . . . . . . . . . .
Length of lower jaw in a line with alveolar margin . . . .
Measurements of skeleton :
Length o f vertebral column (along inferior curve)
, cervical portion
dorsal portion .
, lumbar-portion
, sacral portion
, pseudo-sacral vertebra
caudal portion
, humerus
• tibia (along internal border)
hand to tip o f middle finger
middle finger
foot . . . .
middle toe . - . .
scapula .
M. rhesus, Irawady, M. rhesus
&■ 9*
Inches. Inches. Inches.
. 3 85 3 2 4 2-63
. 5 23 4 ;57 4-13
, 3 5 2 3-26 3-28
. 3-90 3-40 2-90
. 2 4 5 2 0 8 2-28
. 2 9 7 2-40 2-47
. 3 - 0 3 2-48 2-40
1-58 1-41 1:16
. 2-41 2 0 0 1-78
. 1-75 1-75 Ì-85
. 3 57 2-91 3 0 0
. 1 4 3 1-40 1-33
Í ’30 1-15
0-85 0-90
. 0*93 0-96
.' 3-62 2-91
Irawady,
n
Inches.
2-63
. .21-93
1-88
4-60 ■
4-50
1:50
0-45
9 0 0
5-57
5-94
. 6-10
5-50
4*25
. . 3-37
5"75
4-10
3 6 2