270 STUDY OF BKAIXS OF SIX EMINENT SCIENTISTS ANT) SCHOLARS. 



The mesal surface of the superfrontal is fairly complex but not as wide throughout 

 as the cori'esponding gvre on the left side. The paracentral gyre is somewhat larger 

 than that of the left. 



Fissures of the Parietal and Occipital Gyres. {Lateral Surface.) The Postcentral 

 Fissural Complex. — It is rather difficult to determine the limits of the segments which 



Fig. 50. — Dorso-caudal view of the brain of Harrison Allen. 



make up the postcentral fissural complex. On the whole it is an extremely irregular 

 .system with numerous modifications. It joins the parietal and the zygal transparietal. 

 The transpostcentral is unusuall}^ long. 



The parietal fissure joins the paroccipital fissure in the usual manner. The ce- 

 phalic stipe of the paroccipital dips into the occipital cleft so that on a superficial view 

 the two fissures appear to be confluent. Beside the exoecipital complex and the super- 

 temporal fissure the intermedial may be mentioned, appearing as a branch of the 

 parietal. 



Mesal Surface. — The precuneal fissure is of the usual zygal shape with fairly long 



