434 



PKOFESSOR G. ELLIOT SMITH. 



(5) The peculiar histological formation which I shall call 

 " paraterminal body," is a structure of great morphological 

 interest and importance, the essential unity of the various parts 

 of which has not hitherto been recognised by other writers. It con- 

 sists of a large ganglionic mass (figs. 3 and 4), which is directly 

 continuous in front with the olfactory peduncle (2). It extends 

 backward as far as the lamina terminalis, and extends upward 

 to fill up the gap between the corpus callosum and the hippo- 



— *n— -Olfactoiy bulb. 



Tuberculmn 

 olfactorium. 



Pyrifonu 



lobe. 



Fascia 

 t dentata. 



Locus perforatus auticus. 



Fig. 2. — Diagram represeuting the ventral surfaces of the cei-ebral hemisphei-es 



of the typical brain. 



campal commissure (psalterium). This part of the body becomes 

 greatly stretched in many mammals by a large corpus callosum, 

 and is then known as a folium of the septum lucidum. 



The surface of this paraterminal body I have distinguished in 

 several earlier memoirs as the precommissural area, and the 

 ganglionic mass itself was referied to at different times as the 

 " corpus praecommissurale " and " corpus paracommissurale." 

 For these unwieldy terms I propose to substitute the name 

 " paraterminal e," not only because it is less cumbrous, but 



