OLFACTORY CENTERS IN TELEOSTS 247 
It is concluded, therefore, that the materials found in the am- 
phibian primordium hippocampi are not completely separated in 
the teleosts from the other elements of the secondary olfactory 
nucleus, being represented chiefly in the nucleus olfactorius dor- 
salis or primordium hippocampi and to a less degree perhaps in 
the nucleus olfactorius lateralis and nucleus pyriformis. 
The term ‘epistriatum’ has not been used in this article in the 
description of the telencephalic nuclei, owing to the fact that it 
has been applied by different authors, with resulting confusion, 
to morphologically different structures. It was originally used 
by Edinger (96), to designate a structure found dorsal to the stria- 
tum in the lateral wall of the reptilian forebrain. Its connections 
here show clearly that it is morphologically a lateral structure. 
corresponding to the nucleus sphaericus of students of reptiles. 
The epistriatum of birds, as described by Edinger, is likewise a 
lateral structure. Turning to the so-called epistriatum of the 
anamniotes, a different condition is immediately noted. Edinger 
(06a) and Kappers (’06) describes as epistriatum in teleosts a 
medial area reached by the tractus olfactorius medialis which 
seems to include a part of our precommissural body, but in their 
later works this name is applied to our nucleus olfactorius dor- 
salis. Catois uses the term for the dorsal portion of the 
palaeostriatum. Johnston (’06) places the epistriatum of teleosts 
on both the medial and lateral parts of each basal lobe, although 
these two areas belong to morphologically different structures. It 
is difficult to see how the term can continue in use without con- 
stantly increasing confusion. Even if all workers had clearly in 
mind the morphological characteristics of the different varieties 
of epistriatum, it would seem unwise to use the same name, even 
with a modifying adjective, as does Kappers in his later work, 
for such morphologically different structures. 
From the preceding discussion it is clear that the localization of 
function in the telencephalon of teleosts has not advanced so far 
as in Amphibia and Dipnoi with more fully evaginated hemi- 
spheres. This is probably the explanation of the fact that the 
diencephalic regions are also far less clearly analyzed than in Am- 
phibia, and that nearly all parts of the basal lobes seem to be 
