220 THE LOWER PRIMATES 



In regard to this nucleus in mycetcs, it is important to note that the struc- 

 ture is not only more extensive in its general dimensions, but also begins to 

 manifest, even if in a somewhat ill-defined manner, that tendency toward 



FIG. 121. MYCETES SENICULUS. LEVEL OF THE CEREBELLAR NUCLEI. 



CBL, Lateral Lobe of Cerebellum; dt, Deitersal Tract; Gow, Ventral Spinocerebellar Tract; icp, Inferior 

 Cerebellar Peduncle; lo. Inferior Olive; mf, Mesial Fillet; nd, Deiters' Nucleus; ndt. Dentate Nucleus; 

 NFG, Nucleus Fastigii; nr, Nucleus of Rolando; NSC, Nucleus of Schwalbe; pd, Predorsal Bundle; pl, Pos- 

 terior Longitudinal Fasciculus; pv. Pyramid; rst, Rubrospinal Tract; spt. Spinothalamic Tract; trd. 

 Descending Trigeminal Tract; ver, Vermis of Cerebellum. [Accession No. 148. Section 160. Actual Size 

 13X9 mm.] 



convolution of its surfaces typical of the higher primates. It may be inferred, 

 therefore, that the degree of coordination which the cerebellum furnishes to 

 the somatic muscles is greater in mycetes than in lemur or marmoset. The 

 necessity of such coordination becomes clear in the light of the increased 



