3i8 



THE INTERMEDIATE PRIMATES 



ridge-pole also has a higher elevation. The foliation upon this surface is 

 typical of all simiatis, i.e., continuous across the midline over the vermis into 

 the lateral lobe without sulcal interruption. The occipital surface presents a 



FIG. 165. DORSAL SURFACE OF BRAIN OF MACACUS RHESUS. 



[Actual Length 56 mm.) 



Key to Diagram, fiss. sylv.. Fissure of Sylvius; sulc. precent. inf.. Sulcus Precentralis Inferior; sulc. 

 RETROCENT. INF., Sulcus Retrocentralis Inferior; sulc. temp, sup., Sulcus Temporalis Superior; sup. long. 

 FISS., Superior Longitudinal Fissure. 



definite median elevation, the vermis, separated from the lateral lobes by 

 the two paramedian sulci; so that the vermal folia here are separated by 

 definitely longitudinal sulci, while there is a deflection of the sulcal lines in 

 the lateral lobes, do\\ nward and forward. The petroso-ventricular surface of 

 the cerebellum presents its characteristic features. At its lateral extremity 

 is the cerebello-pontile angle in which is contained a flocculus of moderate size. 

 The remaining portion of this surface is in relation with the roof of the fourth 

 ventricle, and thus, until the oblongata is removed by dissection, concealed 

 from view. 



