130 



ANATOMY OF VERTEBRATES. 



to mark the homology of the forepart of the sylvian fold in 

 Quadrumana, Its upper part is now denned from the forepart or 

 " anterior lobe " of the brain, by the fissure 12, figs. 109, 116, which, 

 instead of being continued with or from the longitudinal one, as 

 in Lemur, fig. 116, 8, extends from without, obliquely inward and 

 backward, to or near to the interhemispheral fissure. It is that 

 which, from being first well defined by the Italian anatomist ■ in 

 the human brain, has been called " fissura Rolandi," but which I 

 term " coronal," or " coronal part " of the medilateral fissure, in 

 Ferines, figs. 88-92, 12.' 



In the side view of the human hemisphere, fig. 115, the fissures 

 are indicated as follows : — 2, ectorhinal, external to the crus 

 rhinencephali, it is longer and more conspicuous in the lower 

 Mammals, fig. 107, 2, 5, sylvian, 8, supersylvian, 9, postsylvian, 

 9', subsylvian, 12, coronal, 1.3, lambdoidal, 14, frontal (or post- 

 frontal), 14/, superfrontal, 14", midfrontal, 14 /// , subfrontal, 14 X , 

 ectofrontal, 17, occipital (or superoccipital), 17', exoccipital, 17'", 

 ectoccipital. The folds or convolutions are : — d, ectorhinal, e, 

 sylvian, /, postsylvian, f, subsylvian, g, supersylvian, I, medial, m, 

 medilateral {I and m, as in Quadrumana, are less distinct from 

 each other, as well as shorter and more oblique, than in Carni- 

 vora), n, frontal (or postfrontal) n', superfrontal, n" , midfrontal, n"' , 

 subfrontal, n % , ectofrontal,/?, lambdoidal, q, superoccipital, q f , mid- 

 occipital. Homologous fissures and folds in the brains of the 



Homo. Adult. 



Chimpanzee. 



infant, fig. 113, and chimpanzee, fig. 114, are indicated by similar 

 figures and letters. 



j In the upper view of the human hemisphere, fig. 116, the fol- 

 lowing fissures are marked: — 5, sylvian, 8, supersylvian, 9, post- 



