Ie 
51 
and opposable to the others. Dental series interrupted by diastemas, 
especially in the upper jaw between canines and incisors. Hair dense. 
( Simic.) : 
A. A bony external auditory meatus well developed, at the bottom of 
which is the membrana tympani. Pre-molars 3X2. (Teeth M 3 PM 2 
C1122.) Nose with the median septum thin and narrow (exception- 
ally, broad), and the nostrils correspondingly approximated. (Simie 
catarrhine.) ; 
1. Spinal column with a slight sigmoid curve; lumbar as well as dorsal 
neural spines directed more or less backwards. Sacrum large and 
solid, composed of four vertebre tapering gradually backwards. 
Sternum broad and short, with three or four bones between the manu- 
brium and xiphoid cartilage. Anterior. limbs much longer than 
posterior. 3 
SIMIIDAE. 
2. Spinal column with a simple curve; neural spines of lumbar and 
last dorsal vertebre inclined forwards. Sacrum moderate, composed 
generally of three vertebra not tapering gradually. Sternum elongated 
and narrow. Anterior limbs shorter than posterior; rarely elongated. 
(II.) 
CYNOPITHECIDAE. (III.) 
B. Bony external auditory meatus null, and the tympanic membrane 
attached to a ring close to the surface. Pre-molars #2. Nose with 
the septum broad and flattened (exceptionally, narrow), and the nostrils 
proportionally distant. (Simia platyrhine.) 
1. Teeth (M2? PM2C1412x2=) 35. Manus with inner digit (when 
developed) more or less slightly opposable to the rest. 
CEBIDAE. 
2. Teeth (M 2 PM 3 C0 112xX2=) 32. Manus with inner digit not 
opposable, but on same plane as rest; all armed with elongated com- 
pressed claws. 
MIDIDAE. 
I, HOMINIDAE. 
Single genus. 
Homo. 
Il. SIMIIDAE. 
SUB-FAMILIES. 
Form robust. Ilia broad, alate. Cerebrum projecting backwards over 
the cerebellum. Buttocks without callosities. 
SIMIINAE. 
II. Form slender. Ilia narrow, not alate. Cerebrum scarcely or not pro- 
jecting backwards over the cerebellum. Buttocks with callosities. 
HYLOBATIN AE, 
(IV.) 
(V.) 
(B.) 
