302 THE BRAIN OF QUADRUMANA. 



Three other Fissures of secondary importance are easily 

 recognizable in each of the great man-like Apes, as well 

 as in many of the lower forms, viz., the Parallel Fissure, 

 situated parallel with, and posterior to, the fissure of Syl- 

 vius, in the long axis of the Temporal Lobe ; the Calloso- 

 marglnal Fissure on the inner side of the Hemisphere 

 (fig. 120), just above the Corpus Callosum ; and the Fissure 

 of the Hippocampus, situated near the junction of the inner 



FIG. 121. Brain of Orang, side view. (Vogt, after Gratiolet.) Letters of reference 

 as in Figs. Ill, 133, and 142 with which compare. 



with the under surface of the posterior half of the Hemi- 

 sphere (fig. 120, /. c). 



Next to the Sylvian, the * Parallel Fissure ' is the most 

 constant of the markings on the outer surface of the Cere- 

 bral Hemisphere (fig. 105) ; though after this, according to 

 Flower, " the most persistent fissure on the outer face 

 appears to be the one bounding the upper border of the 

 angular gyrus " (fig. 107, m). The same anatomist adds : 

 " But it is, perhaps, the sulci of the inner face of the hemi- 



