RHINENCEPHALON OF DELPHINUS 503 
of the olfactory cells), pedunculus olfactorius, tractus olfacto- 
corticalis (figs. 1 and 2), medial and lateral olfactory gyri, and 
lobus pyriformis (figs. 1 and 2). The regio parolfactoria com- 
prises the lobus parolfactorius (in man, preferably called emi- 
nentia parolfactoria), the planum septale and stylus septi. The 
planum septale is Beccari’s term for the anterior perforated space 
of human anatomy, while the stylus septi comprises two struc- 
tures—the diagonal band of Broca (bandelette diagonale), and the 
gyrus subcallosus of Zuckerkandl. In the microsmatic human 
brain, having great pallial development, the bulbus is extremely 
SF, 
[Abe sub. perf ant.-~\ $ 
( 
AVE 
désert \\) 
SY 
SS 
lok. tem. 
Fig. 4 Anterior portion of base of brain of dolphin, anosmatic and with 
large and highly convoluted pallium. 
Shows lack of external olfactory structures 
and presence of a conspicuous oval field on each side, lobule désert, where the cor- 
tex is lacking, and the head of the corpus striatum comes to the surface. 
distinct furrows marked off the lobule désert in this brain. 
Very 
is: 
ABBREVIATIONS 
FIGURES 1 To 4 
b.o., olfactory bulb 
e.par., eminentia parolfactoria (fig. 3) 
fov.limb., fovea limbica, or ectorhinal 
fissure 
g.o.l., lateral olfactory gyrus 
g.o.m., mesial olfactory gyrus 
gy.hip., gyrus hippocampus 
inf., infundibulum 
l.p., lobus pyriformis 
l.par., lobus parolfactorius (= emin- 
entia parolfactoria, fig. 3) 
lob.fron., frontal lobe 
lob.temp., temporal lobe 
lobule désert, or désert olfactif, Broca 
op.tr., optic tracts 
p.o., pedunculus olfactorius (or ol- 
factory tract, fig. 3) 
p.s., planum septale (piano settale) 
or anterior perforated space 
s.s., Stylus septi 
t.o.c., tractus olfacto-corticalis 
