SEPTUM, HIPPOCAMPUS, PALLIAL COMMISSURES 473 



Figs. 82 to 90 Diagrams to illustrate the relations of the hippocampus, hippo- 

 campal primordium and paraterminal body. The medial surface of the right 

 hemisphere is drawn in each case. The paraterminal body is shaded with hori- 

 zontal lines, the hippocampal primordium is distinguished by means of spindle- 

 shaped spots or flecks and the hippocampus is in solid black. The commissures 

 are merely outlined with pen lines. All the diagrams except those of the bat 

 and the bear are drawn from dissections. 



Fig. 82 Diagram of the brain of a reptile to illustrate the relations of hippo- 

 campus and paraterminal body as defined by Elliot Smith. The outline is taken 

 from the turtle's brain. Herrick recognizes that the narrow ridge over the fora- 

 men in the turtle is primordium hippocampi but describes a much larger supra- 

 foraminal portion of the paraterminal body in lizards. 



Fig. 83 Diagram of the brain of the rat similar to the last. The whole 

 commissural system is supposed to be imbedded in the paraterminal body. 



