52 



THE MAMMALIAN ORDER PRIMATES [SECT. A 



CENTRAL SULCUS 



TRAPARIETAL sulcus 



SULCUS LUNATUS 



TRANSVERSE 

 OCCIPITAL SULCUS 



ALLEL SULCUS 



FISSURE OF SYLVIUS 



CALLOSO-MARQINAL SULCUS 



INCISURA TEMPORALIS 

 OR RHINAL FISSURE 



COMPENSATORY SULCUS 



. - PARIETO-OC04PITAL 



OSSA 



'POCAMPAL FISSURE 



Fig. 25. The cerebral hemispheres of a Gibbon (Simiidae) : the lateral and 

 mesial aspects are shewn. (Hose Donation n. Mus. Anat. Cant.) 



