Jokn Warren 15 
larly. There can be no question about the glandular nature of the para- 
physis, and its circulation is evidently sinusoidal. 
The choroid plexus, Ch. Pla., Fig. 17, appears as a confused mass of 
GING 
* Clsiaoyeo =" 7 
SDS 
Fic. 20. Small portion of adult paraphysis, same section as Fig. 17, X 560 
diams. 
vessels covered by a thin layer of cells. This mass completely fills up 
the cavity of the fore and mid brains, and may in some cases appear in 
the hind brain, Fig. 23, though there seems to be considerable variation 
Fig. 21. Wax model of epiphysis of adult necturus. > 280 diams. 
in the caudad development of this part of the plexus. The two parts 
of the plexus overlap each other, and are also closely interlaced. 
The epiphysis, H, is still attached to the brain by a very narrow stalk. 
The body overlaps the stalk somewhat-behind, and then is prolonged 
forward as an oval flattened body above the roof of the diencephalon, and 
