578 DR. J. MURIE ON THE ANATOMY OF THE SEA-LION. 
al. Corpus albicans. 
pv. Pons Varolii. 
ce. Corpus callosum. 
1. Olfactory. 
1*. Olfactory bulb. 
bo 
3. Motores oculorum. 
4. Pathetici. 
5. Trifacial. 
h Hollow. 
ji. Flocculus. 
to. Tonsil (or amygdala). 
a. Anterior lobe. 
m. Middle lo be. 
. Optic (at commissure). 
Parts Base and Internal Face. 
py. Anterior pyramid of medulla oblon- 
gata. 
f. Fornix. 
Nerves. 
6. Abducentes. 
7. Facial and auditory. 
8. Glossopharyngeal and pneumogastric. 
8*. Spinal accessory. 
9. Hypoglossal. 
ce. Cervical (anterior). 
Cerebellum. 
p- Posterior lobe. 
sv. Sup. vermiform process. 
ds. Lobus superioris. 
“i. Lobus inferioris. 
PLATE LXXIX. 
Fig. 44. Inner surface of the right half of the same Otary’s brain, of natural dimensions: 
Ma, great marginal convolution ; em, calloso-marginal sulcus ; Ca, callosal gyrus; C7, 
its callosal lobule ; Q/, quadrilateral lobule; Jo, internal occipital lobule, more fully 
shown in fig. 41, and marked Lod’; +*, a ridge therefrom partly connecting it with 
the quadrilateral lobule ; ip, internal perpendicular fissure ; ocp, occipital sulcus (see 
fig. 41); cc, corpus callosum; sp, splenium; g, genu; f, fornix; DV’, fifth ventricle ; 
th, thalamus opticus; pz, pineal gland; c*, corpora quadrigemina; V*, fourth ven- 
tricle ; acm, anterior commissure; av, arbor vite; al, corpus albicans; 1, olfactory 
bulb ; 2 and 3, second and third nerves; pv, pons Varolii; ap, anterior pyramid of 
medulla oblongata. 
Fig. 45. Horizontal section of the left cerebral moiety, exposing the cavity of the 
lateral ventricle &c.: ac, anterior cornu; cs, corpus striatum; cf, corpus 
fimbriatum, overlying choroid plexus; ¢h, thalamus opticus; pe, posterior 
cornu, the dotted line in front, indicating the middle or descending cornu ; 
sy, Sylvian fissure ; 1*, olfactory bulb. 
Fig. 46. Somewhat enlarged outline of the under surface of the left temporal lobe and 
neighbouring parts. The middle or descending cornu is opened into, and the 
