Subclass I. Unguicvlata. Bipeds, or qnadrumana, with thejivgers and 

 toes elotif/afc, Jlexihle, and armed witJt cknvs or nails. 



Order I. PRIMATES. 



The front and often the hind limbs with a distinct thumb opposable 

 to the fingers or toes. Teats two or four on the chest. Penis free, 

 pendulous. Cutting-teeth |-, ^, or A. The fingers and toes are 

 usually long and flexible, clawed. 

 Primates, Linn. 



The Aye-Aye (Daubentonia) has only two kinds of teeth, similar 

 in form to the Glires ; but it has the other characters of Primates. 



In some Monkeys of the Eastern and Western Hemispheres the 

 thumb of the hand is small, or entirely wanting. In the Monkeys 

 of the Western Hemisphere it is generally not opposable to the 

 fingers ; but their hands arc so like the hands of other Monkeys 

 that no one can mistake them for the fore feet of other Mammalia, 

 and they have the rest of the characters of the Primates. 



Synopsis op Suboedees and Families. 

 Suborder I. Bimana. Hand only with an ojjposable thvmh. 

 Family 1. HoinNii)^. Cutting-teeth f, contiguous, opposed. 



Suborder II. Quadrumana. Hands and feet with an 02')posahle thumb 

 and great toe. 



* Teeth of three kinds. 



Family 2. Simiad^. Cutting-teeth \, contiguous, erect, opposed. 

 Nostrils in front of nose, separated by a narrow septum. Claws 

 all alike, of thumb broad. Grinders f . \. Buttocks often callous. 

 Eastern Hemisphere. 



Family 3. Cebid.5:. Cutting-teeth \, contiguous, opposed, erect or 

 suberect. Nostrils on side of nose, separated by a reiy broad 

 septum. Claws all alike, of thumb broad. Grinders f . f, rarely 

 I . f . Buttocks haiiy. Western Hemisphere. 



Family 4. Lemurid^. Cutting-teeth | or |, dissimilar, upper small, 

 separate in pairs, vertical ; lower larger, contiguous, shelving. 

 Claw of the second toe subulate ; the others flat. Eastern 

 Hemisphere. 



Family 5. Tarsiidje. Cutting-teeth |,subsimilar, erect ; upper large, 

 conical, lower small, contiguous. Claws of the second aud 

 third toes subulate ; the others flat. Asia. 



** Teeth of only two kinds. Canines none. 



Family G. DAtiEENTONiiD^. Cutting-teeth f, compressed, very 

 large, with a space between them and the grinders. Claw of 

 thumb flat, of fingers acute. Middle fingers elongate, slender. 



