DESCRIPTION OF FIGURES 
In all the drawings of sections the vertical arrow points dorsally, the horizontal 
one laterally. Figures 1, 2, 7, 8 and 9 were drawn by Mr. A. B. Streedain, who also 
helped me with all of the other illustrations. 
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Fig. 1 A dorsal view of the cerebellum and medulla oblongata of a young 
Ameiurus melas fixed in formol. Drawn under a Zeiss binocular and magnified 
15 times; for key see figure 2. 
Fig. 2. A projection of the nuclei of the medulla oblongata of Ameiurus 
upon the horizontal plane. The cell groups are drawn in on the outline of fig- 
ure 1, and are based upon projection reconstructions of a young adult Ameiurus 
melas 12 em. long. The facial and vagal lobes are outlined by broken lines; 
Mauthner’s cell and the Miiller’s cells are in solid black on the right side; the 
nucleus motorius tegmenti is indicated by double cross-hatching on the left side; 
the acoustic nuclei are in fine dots, only the lateral parts of the dorsal acoustic 
nucleus being shown; the sensory trigeminal nucleus in coarse dots; the visceral 
motor nuclei (of nerves IX, X, VII and V) are shown by single cross-hatching. 
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