MANUAL OF NATURAL HISTORY. 13 



I.— Class MAMMALS (Mammalia). 



Faculties in most advanced state of perfection ; 

 powers of motion varied ; sensations delicate ; intel- 

 ligence superiorly developed ; young suckled; mostly 

 fitted for walking; a few are enabled to fly, and 

 some are destined to live in the water. 



1. Sub-Class.— PLACENTAL MAMMALS 

 (Placentalia). 



I. ORDER— Man (Primates). 

 Position of body vertical ; senses delicate, and 

 nicely balanced ; organs of voice pre-eminent ; intel- 

 ligence in a high degree ; capable of progressive de- 

 velopment. 



1. Family. — Men (Hominidse). Characters as in 

 Order. 



II. OPtDER — Four-handed Mammals (Quadrumana). 



Limbs more or less lengthened ; possess four or- 

 gans of prehension similar to hands ; generally with 

 an opposable thumb on each. 



1. Family. — Apes (Simiidse). Nostrils divided by a 



narrow septum ; opposable thumbs on fore 

 and hind feet ; generally naked callosities on 

 rump ; sometimes cheek pouches ; usually 

 furnished with a tail. Dentition incis : \ — 

 can. J~J — pre mol: |^J — mol: |~|==32. 



2. Family. — American Monkeys (Cebidse). Nos- 



trils separated by a broad septum; thumbs 

 sometimes absent on fore feet ; no callosities 



