li\DI£.\ 



I 107 



Predorsal bundle, in man, 824, 829 



in marmoset, 167, i6g, 170, fi, 1-3, i-(>, 1-8 

 in mycetes, 215, 217, 218, 220-222, 224, 226, 228 

 in Pitlieciis rhesus, 372, 373, 3-6, 3^8, 38 r, 382, 



384, 386, 403 

 relation of, to regulation of motion, 120 

 in tarsius, 120, 121, 123, 127 



relation of size to automatic movements, 117, 

 1 K) 

 Prefrontal area, development of, significance of, 



<)35 



responsive plasticity in, (>3j 

 Prehensile tail in Cebidae, 16, 230, 2^8, 303 



functional capacity of. In new-world monkeys, 459 



lacking in old-world m()nkeys, 17 



in tarsius and baboon, loj, 106, 303 



in mycetes, 191-203, 210, 212, 230, 2iH, 303 



relation of, to balancing, 263, 264 

 to locomotion, 258, 259 

 to nucleus of Blscliolf, 256, 257 

 to nucleus of Goll, 209, 212, 256, 258 

 to skilled hands, 258, 2-59, 263 



significance of, 12, 13, 15, 203, 2 in, 256, 258 

 Prehistoric man, fossil remains of, 925 



why called Ape man, 926, 927, 928, 936 

 Pre-Ncanderthalold man, 750. See also Paleoan- 

 thropus Heldelbergcnsls 

 Prc-olivary sulcus, in human, 796 

 Pre-paleolllhlc culture, today, 771 



man, types of, 737, 745, 749 

 Primate brain, broad brainedness of, 944, 952 



concavities in, 947 



convolutlonal pattern of, 94" 



diametric indices of, 943, 944, 9-;2 



encephalic indices of, 941 

 significance of, 948, 991 



fissural pattern In, 944, 945, 954 



inferior vermis in, 948 



lobation of, 94, 



occipital lobe of, 948 



olfactory bulb and tract of, 947 



optic chiasm and optic nerves of, 947 



pineal fossa in, 948 



specific modifications of, 992-1045 



structural homogeneity of, 944-948 



vallecula (vcrmal notch) in, 948 

 Primates, bonds of kinship between, 14, 423 



classification of, 21, 22 



comparative study of, 13 



first structural modifications fif. In lemurs, 15 



four divisions of, 22 



Pages 1-474 are in Volume I, 



Primates, intermediate, comprise what, 287 

 nucleus of Goll in, 580 

 vermal ridgepole in. 416 

 why thus grouped, 28- 

 lower, nucleus of Goll in, 580 



vermal ridgepole in, 416 

 pyramidal decussation in, 423 

 six species of, comparative survey of, 426, 427 



unity ol structural design in, 42" 

 superior collicull in, 385 

 Primitive man, time of, Keith on, -31--3,-, -42, 886, 



88-, 891 

 Primordial .auditory organization, relation of, to 

 automatic reactions, in lemur and marmoset, 175 

 Proprioceptive organs, 249 

 of forellmb, 256 



In gorilla, deep sensory inHux from, 660 

 of hind limb, and tail, 49, 305, 317, 318, 

 of internal ear, 262, 431 

 in lemur, 49-51 

 Proprioceptors of body, relay of sensory impulses, 

 374 

 in tarsius, 1 13 



of trunk and extremities in glblx>n, 431 

 of vestibule of internal ear, in chimpanzee, 583, 

 592 

 in dog-headed baboon, 317 

 in gibbon, 431 



in man, high degree of specialization in, 81 1 

 Pseudo-S\l\'ian sulcus, 955 



Pulvinar of optic thalamus in chimpanzee, 605 

 in dog-headed baboon, 301, 337-341 

 in gibbon, 419 

 in lemur, 39, 75, 77, 79 

 in marmoset, 163, 187, 189 

 in mycetes, 209, 235-239 

 in Pithecus rhesus, 363, 395, 397 

 in tarsius, loi, 139, 141, 143 

 Putamen, in dog-he.ided baboon, 333 

 in gibbon, 445 

 in lemur, 70 

 in man, 835 

 in mycetes, 229, 230 

 in Pithecus rhesus, 38", 389 

 Pygmies as pre-paleolithlc, "i 



Pyramidal decussation in chimpanzee, 572, 576,378 

 in dilfcrent mammals, 423 

 in dog-he.ided baboon, 299-J09 

 effect on detachment of ventral gray column from 



central gray matter, 423 

 on field occupied by decussjited fibers, 423 

 paf!cs 475-1120 in Volume II. 



