considered as a zoological Character. 



525 



and influential character of opposable thumbs, either upon 

 one pair of the extremities or upon both, definitely distin- 

 guishes it from all other groups, and renders it at once easy 

 to recognise, and susceptible of a strict logical definition. 

 This principal group or order of mammals, which I propose 

 to call Cheiropeds (Cheiropoda), in allusion to the circum- 

 stance which forms their most important character, with its 

 subordinate groups, or families, of Bimana, Quadrumana, and 

 Pedimana, and the still more subordinate subfamilies which 

 compose the latter two groups, is accurately defined and 

 represented in the following table : — 



'Bi'mana -------- Homo. 



the anterior 



CHEIROPODA 



Mammals with op- 

 posable thumbs 



on 

 extremities only. 



Simice - 

 and with anthro- 

 poid teeth. 



QUADRU N MANA -< 



on both anterior 

 and posterior 

 extremities, 



Lemuridce - 

 _ and with abnor- 

 L mal teeth. 



Pedi'mana - - 

 on the posterior 

 extremities only, 



Simiadce - 

 and with anthro- 

 poid teeth. 



-<! 



f Pithecus. 

 Semnopithecus. 

 Colobus. 

 Cercopithecus. 

 Macacus. 

 CynocephahiSi 



Lichandtus. 

 Propithecus. 

 Lemur. 

 Nycticebus. 

 Otolicnus. 

 MicrocebuSr 

 Cheirogateus. 

 k Tarsius. 



Cebus. 

 A'teles. 

 Mycetes. 

 Lagothrix. 

 Callithrix. 

 Adtus. 

 Pithecia. 

 _ Hapale. 



Gliridcs 

 and with 

 teeth. 



rodent 



- Cheiromys. 



DidelphidcB - - 

 and with abnor- 

 mal teeth. 



Petaurus. 

 Phascolarctus. 

 Pseudocheirus. 

 Phalangista. 

 Balantia. 

 Cheironectes. 

 b Didelphys. 



Q Q 3 



