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DR. J. MUEIE ON THE ANATOMY OF THE SEA-LION. 



al. Corpus albicans. 

 pv. Pons Varolii. 

 re. Corpus callosum. 



1. Olfactory. 



1*. Olfactory bulb. 



2. Optic (at commissure). 



3. Motores oculorum. 



4. Pathetici. 



5. Trifacial. 



Parts Base and Internal Face. 



py. Anterior pyramid of medulla oblon- 

 gata. 

 /. Fornix. 



Nerves. 



6. Abducentes. 



7. Facial and auditory. 



8. Glossopharyngeal and pneumogastric. 

 8*. Spinal accessory. 



9. Hypoglossal. 

 ce. Cervical (anterior). 



h Hollow. 

 fl. Flocculus. 

 to. Tonsil (or amygdala). 

 a. Anterior lobe. 

 in. Middle lobe. 



Cerebellum. 



p. Posterior lobe. 



sv. Sup. vermiform process. 



Is. Lobus superioris. 



li. 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 ; cm, calloso-marginal sulcus ; Ca, callosal gyrus ; CI, 

 its callosal lobule ; Ql, quadrilateral lobule ; Io, internal occipital lobule, more fully 

 shown in fig. 41, and marked Lob* ; *, 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 ; V 5 , fifth ventricle ; 

 th, thalamus opticus; pi, pineal gland; c\ corpora quadrigemina ; V 1 , fourth ven- 

 tricle; acm, anterior commissure; av, arbor vitse; 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 ; ef, corpus 

 fimbriatum, overlying choroid plexus; th, thalamus opticus; pc, 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 



