TROGLODYTES GORILLA 



669 



the gorilla which, because oi" its great weight, has ceased to live so much in 

 the trees, and especially in the uiiperniost jjortions ol them where the 

 branches are too small to bear it, has in consequence changed its modus 



FIG. 302. GOKILLA. LE\ IZL OF THE \ESTIBULAK NUCLEI. 



CTT, Central Tcfimcntal Tract; (;o\v, Ventral Spinocerebellar Tract; iiel, Spino-olivary Tract of Mclwcg; 

 icp, Inferior Cerelxliar Peduncle; 10, Inferior Olive; mf, Mesial Fillet; nar, Nucleus Arciforniis; nu, Nucleus 

 of Deiters; Nsc, Nucleus of Schwalbe; NK, Nucleus of Rolando; n8. Auditory Nerve; pd, Predorsal Bundle; 

 PL, Posterior Longitudinal Fasciculus; py. Pyramid; rei-. Reticular Formation; rst. Rubrospinal Tract; 

 SPT, Spinothalamic Tract; trd. Descending Trigeminal Tract; tub, Tuberculum Acusticum. [Accession No. 

 .1. D. Section 401. Actual Size 22 X mm.] 



\-ivendi to a terrestrio-arboreal adaptation. On the other hand, this recourse 

 to gr()und-li\ ing does not recjuireso much in the way of balancing function as 

 in those animals which chpend whollx upon the arboreal highways for their 

 existence. Lidecd, the almost c|uadrupedal locomotion of gorilla would not 

 in itself call for a highlx de\elo|)ed balancing mechanism. Even if the gorilla 

 docs stand upright upon its hind legs at times, it is only poorly adjusted to 



