428 
rance !) and figures a brush-like radiation of fine processes from the 
ependyma. The opinion of several of the ablest microscopists in Ber- 
lin coincides in the view that our sections are unambiguous and dis- 
tinct. However much it may be altered, the original connection of 
the cell with the ectal surface is maintained. Above the level of the 
inner ganglion layer the walls collapse, though occasional nuclei are 
found in that part lying in the middle gelatinous layer of the tectum. 
Peripherad, the cell ends in a curious terminal body which has also 
been encountered in other regions (fig. 5). Of nervous elements two 
layers are conspicuous. The inner, which has usually been described 
as a granular layer and, according to SANDERS, consists of cells clustred 
like grapes on a stem, although, when suitably preserved, the cell body 
and peripheral processes of these cells can always be seen it frequently 
requires some pains to distinguish them from the nuclei of the con- 
nective cells subjacent in oblique sections. This probably explains the 
continual oversight of this most important layer in the tectum. Only 
the ectal portion seems to be functional and from these cells basal 
op. tr.ceph. 
Torus gel. tr. ton, 
Volvula 
Fig. 8. Transection’of the brain of a small bass. Diagrammatic. Especially designed 
to show the position of the mammillaria and fornix tract (tr. f.) as well as the general 
relations ; gel. tr. tor. gelatinous tract from the torus to periphery of the tectum. 
1) Atti de Lincei Mem. cl. sc. fis. ecc., Ser. 4, Vol. IV. 
re 
