196 



ANTHROPOID APES. 



of the orang, which are high and short, terminate 

 in a beak-shaped curvature, but this is not invariably 

 the case. 



In the anthropoids we have been considering, and 

 also in several of the lower species of apes, there 

 are three other fissures of less importance in addition 

 to those we have mentioned, namely, the fissure 

 parallel to the fissure of Sylvius, and placed behind 

 it, the corpus eallosum fissure, placed immediately 

 above the corpus eallosum on the inner side of the 



Fig. 60. — Lonfritudinal section of a gorilla's^'brain (Bola and Panech). *.C7n, 

 CoUoao marginal fissure. /, j>. Internal parieto-occipital fissure. /, c, Calcarine 

 fissure, the posterior part of the hippocampal fissure. 



hemisphere of the cerebrum, and the calcarine fissure 

 (Fissura calcarina) (Fig. 60). The latter ends near 

 the point of junction of the inner and lower sur- 

 faces of the posterior division of the hemisphere. 

 The upper temporal convolution, termed by several 

 anatomists Gyrus supramarginalis, is said by Gra- 



