( 662 ) 
with Primates the. glandular differentiation of the organ is limited 
to the lobuli laterales, and to the ““Vorraum”, whilst the median 
a d 
b e 
c / 
Fig. 1. 
invagination constitutes only a covering parietes round the nervous part. 
Let us now return to Tarsius. | have reconstructed a model a 
hundred times enlarged of the Hypophysis of the above mentioned 
Embryo N°. 666 corresponding in its development to N°. 34 of 
KeiBer’s Normentafel. This model is represented in fig. 2 as seen 
from aside. The lines running vertically through this figure indicate 
the direction of the section, and the sections indicated by these 
lines are sketched in the figures 3a—. 
In the first place it is conspicuous in this figure that the pharyn- 
geal part of the Hypophysis consists of two parts, a larger, the real 
vesicle, into which from behind the nervous part (indicated by a 
thicker line) is invaginated, and a narrower one apparently turned 
down between the basis of the brain and the larger part in the 
direction of the infundibular-stem. As this part bifurcates in the shape 
of a two-pronged fork, I shall indicate it as Lobulus bifureatus. 
As appears from figure 2 this lobe is connected at the forepole 
of the Hypophysis with the other part. In this anterior part the 
formation of cell-strings has begun. This is the reason that the surface 
