LIST Of II IIJSTRATIONS ix 



Figure Paci; 



01-104. ll;iiul aiul loot ol Mycctcs scniculus 198, 199 



05-108. Hand and loot of s]jidcr monkey 200, 201 



09, no. Distal extremities of preliensilc tails, Mycetes seniculus and Ateles ater. . , 203 



11. Dorsal surfaee of brain, Mycetcs senieulus 204 



12. Base of brain. M\cetes senieulus 205 



13. Left lateral surfaee of brain, Mycetcs senieulus 206 



14. i^iglit lateral surfaee of brain, Mycetcs senieulus 20~ 



15. Ventral surface of brain stem, M\cetes senieulus 208 



16. Dorsal surface of brain stem, .Mycetcs senieulus 209 



i~. Mycetcs senieulus. Level of the pyramidal ticcussation 211 



18. Mycetcs scniculus. Le\el ol the caudal c\trcmit\ ol the inferior olive 215 



19. Mycetes senieulus. Level through the middle of the inferior olive 2i~ 



20. iMycctes senieulus. Level of the nucleus ambiguus 218 



21. Mycetcs scniculus. Le\ el of the cerebellar nuclei 220 



22. Mycetcs scniculus. Lc\cl of the vestibular nuclei 221 



23. Mvcetes scniculus. Level ol emergence of sixth nerve 222 



24. Mycetcs scniculus. Level through middle of pons X'arolii 224 



25. Mycetcs scniculus. Level of the inferior colliculus 226 



26. Mycetes scniculus. Lcxel of the superior colliculus 228 



2". Mycetes scniculus. Level of the optic chiasm 229 



28. Mycetes scniculus. Lcxel of the anterior commissure 230 



29. Ventral surfaee of the gray matter of the brain stem, Mycetes scniculus (color) . 235 



30. Dorsal surface of the gray matter of the brain stem, Mycetes senieulus (color). . 237 



31. Lateral surface of the gray matter of the brain stem, .Mycetes senieulus (color) . 239 



32. Habitat group. Baboon at the water hole 290 



33. Papio cynoecphalus (baboon) 2yi 



34-13-. Hand and loot of Papio cynoceplialus 292, 293 



38. Dorsal surface of brain, Papio e\ nocephalus 296 



39. Base vi brain, Papio c\noccphalus 29" 



40. Right lateral surface of brain, Papio cynoecphalus 298 



41. Left lateral surface of brain, Papio cynoecphalus 299 



42. Ventral surfaee of brain stem, Papio cynoecphalus 300 



43. Dorsal surfaee of brain stem, Papio cynoecphalus 301 



44. Baboon. Level of the pyramidal decussation 306 



4,-. Baboon. Le\ el of caudal extremitxof nucleus of Burdaeii 309 



46. Baboon. Level of the caudal extremity of the inferior olivary nucleus 311 



4-. Baboon. Level through the middle of the inferior olive 313 



48. Baboon. Le\el of the Ncstibular nuclei 3'6 



49. Baboon. Lc\ el of the cerebellar nuclei 3'9 



50. Baboon. Level of emergent fibers of sixth nerve and caudal libers of pons. . . . 321 

 ii. Baboon. Level at midille of pons, showing entering trigcminaMibers 324 



52. Baboon. Level of inferior colliculus showing emergence of fourth nerve 326 



53. Baboon. Level of the inferior colliculus 327 



