QUADRUMANES. 433 



have acquired a slight covering of hair, and of which the head was 

 an inch and a half in length, I found the whole of the deciduous 

 series in place, in number as follows : 



O n 1 __1 2 2 



Incisors — : canines — ; molars -— = 20. 



2—2 ' 1—1 2—2 



The representatives of the molars were not quite one line in length, 

 slender, and with simple and very shghtly enlarged crowns ; the 

 canines were larger and more curved. 



CHAPTER IX. 



TEETH OF QUADRUMANA. 



In entering upon the study of these organs in the extensive 

 group of mixed-feeding placental Quadrupeds, associated together 

 by the common character of the opposable thumb on the hind-foot, 

 and to which Cuvier has applied the name Quadrumana, (though 

 this name be strictly applicable only to the old-world SimicB 

 of Linneeus), we are met at the outset by two very singular and 

 anomalous conditions of the dental system in the genera Galeopithecus 

 and Cheiromys. 



167. — The Colugos (Galeopithecus) resemble the Bats in the 

 great expanse of their parachute, formed by the fold of integument 

 extending on each side from the fore to the hind extremity ; but they 

 appertain by the essential characters of their organisation to the 

 LemuridcB : the dental formula of the genus (PI. 114, tig. 1, la, ib.) is: 



1-1 , 2—2 



Incisors — ; canines — ; premolars — ; molars -— : = 34. 



3 — 3 1 — 1 2 — 2 3 — a 



The two anterior ihcisors of the upper jaw are separated 

 by a wide interspace : in the Philippine Colugo they are very 

 small, with simple sub-bilobed crowns ; but, in the common 

 Colugo {Lemur volans, Linn. Galeopithecus Temminckii, Wat.) 

 their crown is an expanded plate with three or four tubercles ; the 

 second upper incisor, which is unquestionably supported by the 



F F 



