862 MR HAROLD AXEL HAIG ON THE 
VII. Tae HisrotogicaAL FEATURES OF THE VERMIS OF THE CEREBELLUM. 
1 
(Text-fig. 6.) 
A section across the lamellar of the vermis (or of the hemisphere) shows the typical 
arrangement characteristic of higher mammals, viz. a white centre, an inner layer of 
‘“oranules” (small nerve-cells, the axons of which pass peripherally), an intermediate 
layer of the large flask-shaped cells of Purkinje, the axons of which pass centrally, the 
dendrons passing peripherally, and a superficial “ molecular” layer, consisting of small 
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Fie. 6.—A portion of a vertical section of the vermis of the cerebellum. x 6. 
g. Layer of granules (small nerve-cells and axons 
of the Purkinje cells). 
J. Fibres of the white centre. 
m. Molecular layer. 
p. Layer of large Purkinje cells, 
nerve-cells, the dendrons of Purkinje cells and fibres derived from neuroglia cells, and 
the “climbing” and “ moss” fibres coming from the deeper layers. 
The only point of comparative value is the relatively large size of the Purkinje cells ; 
these are not only large, but exist also in greater numbers than are usually met with in 
an equivalent area of the human type. 
[The uncinate gyrus and optic chiasma present much the same features as the same 
regions in the human type: no points of comparative value were made out in the 
sections. | 
PART II. 
Tue Histotocy or THE Prrurrary Guanp. (PI. II. and Text-figs. 7, 8, 9.) 
The pituitary gland of the Weddell seal is a body of considerable histological 
interest, inasmuch as all three portions are well developed, and in addition there occurs 
upon its upper aspect a small portion of tissue the structure of which is not represented 
in the human pituitary.* 
The gland (text-fig. 7) is a large one, and is made up of three main portions, viz. 
* It is possible that this structure is represented in some of the lower types by the sacci vasculosi found in 
connection with the pituitary gland. 
