1864.] MR. W. H. FLOWER ON THE BRAIN OF MYCETES. 335 
“++ The hand broad; the index finger abortive, clawless ; eyes 
moderate. Perodicticina. 
*©15. Preropicticus, Bennett. 
** Tail shorter than the body. The hands and feet large. Fingers 
and toes free at the ends ; the index finger rudimentary, but distinct. 
Lower cutting teeth large and prominent, and projecting. The apices 
of the vertebre of the back, neck, and withers projecting beyond the 
skin, like prickles.” 
16. ARCTOCEBUS. 
‘Tail very short. Hands and feet small, with the lower phalanges 
(not including the thumb) united in the skin, the two upper joints 
free; the index finger abortive, reduced to a tubercle. Lower cut- 
ting teeth small, hyaline, hidden by the lips.” 
Leaving the skeleton (the characters of which I propose to discuss 
on a future occasion) out of consideration, the facts which I have 
brought forward in the present communication appear to me to 
justify, though on grounds different from those stated by Dr. Gray, 
the establishment of the new genus Arctocebus for the Angwantibo. 
This genus is distinguished from all other Lemuride by the com- 
bination of the following characters :— 
The tail rudimentary. The pinna of the ear has two projecting 
shelf-like lamellze above the auditory meatus. The index finger 
; y - 2-2 ay 
is rudimentary and nailless. The dental formula—z. aye 3 
3—3 a 
pm. = m.5—,. The anterior upper molars have oblique ridges 
and are quadricuspid, the last is tricuspid. The last lower molar 
quinquecuspid. 
In Perodicticus, on the other hand, the tail is distinct, though 
short. The pinna of the ear has only one complete shelf-like la- 
mella. The index finger is rudimentary and nailless. The dental 
seuss O23 ed 3-3 3-3 : 
formula is—z. 5-5; c. ia; pm. 5-3; m. 5-3. The anterior upper 
molars have oblique ridges and are quadricuspid, the last is bicuspid. 
The last lower molar is without a fifth cusp. 
9. On THE Bratn or THE RED Howiine Monkey (Mycrres 
SENICULUS, Linn.). By Witt1Am Henry Fiower, F.R.S., 
ETC., CONSERVATOR OF THE Museum oF THE RoyAL CoL- 
LEGE OF SURGEONS. 
(Plate XXIX.) 
One of the most important omissions in the great work of Gra- 
tiolet ‘‘ On the Cerebral Convolutions of the Primates” is that of a 
description of the brain of any member of the well-marked genus My- 
cetes. This may easily be accounted for by the extremely rare occur- 
rence of these animals in a living state in Europe, and the difficulty 
of preserving the brain in the hot climate in which alone they are 
