72 Journal of Comparative Neurology. 



Fig. 6. Cells from the frontal region, point indicated by Fig. 2c. 

 Drawn with 1-12 obj. 



Fig. 7. Cells from the habena, point indicated at Fig. 5, (6rt'). 

 Drawn as above. 



Fig. 8. Cells from meso caudal part of the hemisphere, point indi- 

 cated in Fig. 2e. as above. 



Fig. 9. A cell from the tectum opticum above the general level of the 

 ganglion layer. Compare Fig. 12, as above. 



Fig. 10. Cells from the Meynert's nidulus, point indicated in 



Fig- 5^- 



Fig. II. Cells from the caudal part of tectum near the mesal line. 

 The fibres are parallel with the ventricle. A bifurcated fibre is indi- 

 cated. 



Fig. ij. A section from the venticular epithelium to above the 

 ganglion layer. Drawn with a camera lucida and I-12 objective. Pains 

 was taken to indicate no more than could actually be seen in this section. 

 Those cells in which no processes were drawn have doubtless lost the cell 

 body by the solvent action of the reagents. The cells with horizonal 

 processes seem to belong to a tract distinct from that indicated at a. Fig. 

 3 and b. Fig. 5. A capillary with two blood corpuscles is included in 

 the section. 



PLATE XL 



(For explanation see page xiv). 



PLATE Xn. 



Figs. 1-4. Combination drawings of transverse sections of the brain 

 of the channel catfish. The left side is drawn from a section farther 

 cephalad than the right and in Figs. \-2 the outline of the opposite half 

 is superposed for comparison. 



Figs. ^-?>. Longitudinal sections through r.'he hrd^xn oi Scorpcena. 



