354 JouRNAi, OF Comparative Neurology. 



Some distance dorsad of the section first mentioned, a 

 strong projection of the central lobe passes toward the caudal 

 surface and is interposed between the temporal below and 

 the occipital above. The cells are small pyramids, staining 

 very deeply. There are similar projections along the frontal 

 fissure. Thus, while the pyramidal cells are central, they 

 are connected with the surface of the axial lobe at several 

 points. The occipital lobe dorsally contains flask cells simply, 

 and forms a cap over the one just described. 



In longitudinal sections the caudad projection of the pyra- 

 midal cells of the central lobe is seen to be accompanied by 

 a strong tract. Although the details of these arrangements 

 would be interesting, it is intended to reserve them for a 

 wider range of comparison. 



The temporal lobe merges ventro-mesad into the hippo- 

 campal, both of which contain small flask cells, with clear 

 spherical nuclei and inconspicuous processes. 



The specific representation of the hippocampal niduli is a 

 mass of somewhat smaller and more deeply staining cells, 

 forming a layer near the caudal margin of the lobe, into 

 which the fibres of the radix lateralis may be traced. These 

 cells are grouped in clusters, and are essentially bipolar or 

 flask-shaped. 



The ventral projection of the mesaxial lobe terminates 

 cephalad in the bifid body, which is here recognized as a 

 probable homologue of the corpus fornicis, and caudad of the 

 latter in a gradually diminishing area cephalo-ventrad of the 

 anterior commissure, perhaps homologous with what I have 

 termed the praerhinalic lobe in mammals. Both these areas 

 abound in small, dark-colored and spherical nuclei, like those 

 of the blood corpuscles, and clearly homologous with the 

 so-called Deiter's corpuscles. There are less numerous flask 

 cells of the smallest size. 



The tracts and commissures of the cerebrum complete in 

 a very satisfactory way the chain of evidence begun above. 

 The callosum of fishes was first correctly identified,! believe, 



