588 CHORD ATA. 



Family i. — Lemuridae. — The true lemurs. Found in Madagascar, 

 Africa and the Oriental region. 



Family 2. — Tarsiidae. — Comprising only the peculiar little Tarsius 

 of the Malay Islands. Its incisors are \. The proximal tarsal bones are 

 elongated and two of the hind-digits are clawed. 



Family 3. — Chiromyidae. — Another aberrant lemur, known as the 

 Aye-Aye. It is found in Madagascar, nocturnal and arboreal. It has a 

 rodent-like dentition with incisors growing from persistent pulps. Its 

 dental formula is \%\%. All the digits are clawed but the hallux which 

 bears a nail. The third digit of the manus is very long. 



Fig. 394. — Lateral View of Skull of the 

 Aye- Aye (Cheiromys). 



Note the rodent-like incisors. Dental formula y^^^. 



Distribution of the Lemui'oidea. — The chief feature of 

 the distribution of lemurs is their extraordinary abundance 

 in Madagascar. (For an account of this, see page 602.) 



SUB-ORDER IL — ANTHROPOIDEA. 



The Anthropoidea are advanced types of Primates. They 

 have a tendency to loss of the pollex ; the facial portion 

 of the skull tends to recede below the cranial and the 

 orbits look more forwards than those of the Lemuroidea, 

 being also completely separated from the temporal fossae by 

 a bony partition. The lacrymal foramen in all Anthropoidea 

 opens inside the orbit. The brain is of a higher type, the 



