OLFACTORY CENTERS IN TELEOSTS 191 
lies immediately dorsal, giving off fibers to the nucleus olfacto- 
rius lateralis and nucleus pyriformis. Lateral to the caudal end 
of the fissura endorhinalis lies the nucleus teniae of Edinger, 
Kappers and Goldstein. 
(2) Nuclei. The basal lobes are entirely separate, excepting 
ventrally, where they are joined by the lamina terminalis, which 
runs rostrally from the region of the optic chiasma. At a point 
approximately two-thirds distant from the rostral margin of the 
hemispheres, there lies embedded in the lamina terminalis, the large 
anterior commissure, connecting both lobes (figs. 34 to 61). 
Rostrally, the lobes overhang the olfactory tracts for a short dis- 
tance (fig. 24), while caudally the hemispheres, spreading later- 
ally over the optic tracts, are partly covered by the optic lobes 
(fig. 76). 
The basal lobes contain, in teleosts, the secondary olfactory 
centers, one or more tertiary centers and the so-called corpus 
striatum, here designated the palaeostriatum. In the carp this 
receives, throughout most of its extent, secondary olfactory fibers. 
(a) Corpus precommissurale. Extending from the rostral end 
of the hemispheres caudally into the diencephalon is a column of 
cells, bordering the medial cavity on either side. Its dorsal 
limit is indicated by the sulcus limitans telencephali and it is 
bounded laterally, throughout most of its more caudal portion, by 
the palaeostriatum. 
This is the corpus precommissurale; the area olfactoria posterior 
medialis and epistriatum of Kappers, ’06, but not of Kappers, ’08, 
where this name is applied to the primordium hippocampi; the 
lobus olfactorius posterior, pars medialis of Goldstein; ‘vordere 
nucleus,’ partly, of Bela Haller. At the rostral end of the hemi- 
sphere this nucleus is largely ventral (fig. 25); toward the anterior 
commissure, however, it increases in dorso-ventral extent cover- 
ing practically all the mesal surface of each hemisphere (fig. 35). 
The interposition of the fibers of the commissure separates the 
nucleus into two parts, a dorsal passing above the commissure, 
and a ventral composed of cells lying between its fiber systems 
(figs. 35, 36, 38, 55, 56, 61). Caudally of the anterior commissure, 
these two divisions of the nucleus remain distinct, one continuing 
