430 NILS HOLMGREN 
I. Pallial parts. 
a. Hippocampal pallium (h.p.). 
b. General pallium (g.p.). 
c. Pyriform pallium (p.p.). 
II. Zona limitans (lateralis) (¢.l.l.) and sulcus limitans pallii lateralis 
Gsiod.): 
LII. Subpallial parts. 
d. Nucleus olfactorius lateralis (n.olf.l.) and suleus limitans 
lateralis (s.1.1.). 
e. Corpus precommissurale, pars superior (p.p.s.). 
f. Nucleus olfactorius anterior pars precommissuralis (p.n.0.a.). 
g. Nucleus entopeduncularis, or taeniae (n.t.). 
h. Corpus precommissurale pars inferior (p.p.7.) and, in the 
caudal part of the forebrain, nucleus preopticus. 
COMPARISON BETWEEN THE EVERTED AND THE INVERTED 
FOREBRAIN IN LOWER VERTEBRATES 
A diagram of the inverted forebrain made up in the same way 
as that of the everted shows the following structures (fig. 41): 
I. Pallial parts. 
a. Hippocampal pallium (h.p.). 
b. General pallium (g.p.). 
c. Pyriform pallium (p.p.). 
II. Zona limitans (z.1.) 
III. Subpallial parts. 
d. Nucleus olfactorius lateralis (n.olf.l.) and sulcus limitans 
lateralis (s.l.1.). 
e. Tuberculum olfactorium (t.olf.). 
f. Nucleus medialis septi (n.m.s.). 
g. Nucleus entopeduncularis, or taeniae (Dipnoi) (n.t.). 
h. Nucleus lateralis septi (n.l.s.) and, in the caudal part of the 
forebrain, nucleus preopticus. 
The idea of the comparative anatomy of the everted forebrain 
recently has undergone a very important change, especially 
through the excellent works of Johnston. This author is of the 
opinion that the so-called ‘striatum’ of earlier authors belongs 
to the pallium. He names this part, situated dorsal to the 
zona limitans, the primordium hippocampi. In this part Kap- 
pers and Sheldon have found three different parts, separated 
in teleosts by well-marked sulci. These parts, however, have 
been differently interpreted. KKappers supposes that they 
represent a lateral palaeopallium, a dorsal striatum, and a medial’ 
