90 



M ESSRS. WATSON AND YOUNG ON THE [Jail. ]-i, 



Fig. 5. 



Brain of HycBTia crocida, two thirds natural size. Upper surface. 

 C, crucial sulcus ; S, superior, M, middle, /, inferior external gyri. 



Fig. 6. 



Brain of Hymna crocuta, lateral view. 

 F, syrvian fissure ; other letters as in fig. 5. 



