1^6 THE LOWER PRIMATES 



Brain, including cerebellum and brain stem without meninges 



Longitudinal 31 m"!- 



Transverse -3 '''"'""'■ 



Courtesy, American Museum of Natural History 



FIGS. 69 AND 70. HAND AND FOOT OF MARMOSET. 

 Left. Palmar surface of hand showing poorly developed pahn, rudimentary thumb, well-delined digitation, 



with claws instead of finger-nails. 

 Right. Plantar surface of the foot showing imperfectly developed heel and sole, rudimentary great toe, 



claws instead of toe-nails. 



Total weight of the brain 6.2 gms. 



Total water displacement of the brain 6 c.c. 



Weight of forebrain 4-75 gms. 



Weight of midbrain o . 25 gms. 



Weight of hindbrain 1.2 gms. 



On the basis of these figures the following encephalic indices were 

 computed for the several divisions of the brain: 



