866 HISTOLOGY OF THE CENTRAL NERVOUS SYSTEM OF THE WEDDELL SEAL. 
V. Issuing fibres of 5th nerve. 
s.c.p. Superior cerebellar peduncle. 
p.l.b. Posterior longitudinal bundle. 
J. Tract of the fillet. 
8. Across the upper region of the pons: 
IV. Intercrossing fibres of 4th cranial 
nerves. 
n. IV. Root-bundles of 4th nerves. 
s.p.d@ Decussation of superior peduncles 
of cerebellum. 
f. Fillet. 
9. Across the posterior corpora quadrigemina 
(mesencephalon) : 
Sy. Aqueduct of Sylvius. 
j.ret. Reticular formation. 
p.l.b. Posterior longitudinal bundle. 
s.c.p.. Superior peduncles of cerebellum. 
J, fo. Intermediate and lateral fillet. 
t.d. Decussation of trapezium. 
i.p.g. Interpeduncular grey matter. : 
nm. IIL, n. 1V. Nuclei of the 3rd and 4th cranial 
nerves, 
p-p. Crusta (pes pedunculi). 
sm. Substantia nigra. 
C.Q.p. Posterior corpus quadrigeminum. 
10. Across the anterior corpora quadrigemina : 
p.c Posterior commissure of brain. 
C.Q.a. Anterior corpus quadrigeminum. 
n. III. Nucleus of 3rd nerve. 
jf. Issuing fibres of 3rd nerve. 
f. Fillet. 
Prare II. 
A. Portion of the posterior part of the anterior 
lobe of the pituitary gland (Leptonychotes 
weddellvi). x 500: 
g. Large granular cells, staining deeply 
with eosin. 
sin. Sinusoidal blood-spaces, some of 
them containing erythrocytes, 
and occasionally showing an 
endothelial lining (.ep.) indi- 
cative of a true capillary. 
B. Portion of the anterior part of the anterior 
lobe of the pituitary gland. x 500: 
syn, Syneytium, including here and 
there large isolated cells typical 
of the posterior part of the 
anterior lobe (4). 
v. True capillaries. 
C. Part of the pars intermedia of the pituitary 
gland. x 500: 
syn.p. Syncytium =fused spindle-shaped 
cells with nuclei (”.) embedded — 
in the protoplasm. 
col. Colloidal substance at the edge of 
the pars intermedia. 
D. Part of the posterior lobe of the pituitary gland: 
n.f. Neuroglia fibres. 
n. Nuclei of neuroglia cells. 
col, Isolated colloid masses. 
coll, Large mass of colloid in a vessel (v.). 
