. The Journal of comparative neurology and psychology. Fig. 9. Three sagittal sections of the tectum of Scyllium stellare. A, nearlymedian, showing the greatest extent of the nucleus tecti. B, through thelateral part of the aqueduct. The mesencephalic bundle is seen passingbeneath the trochlearis. C, farther laterad. The fibers of the decussatio veilturn downward and forward as the tertiary gustatory tract. The radixmesencephalica passes caudad on the inner surface of the acusticum. X 16. Johnston, The Radix MesencephaUca Trigemini. 6ii or deep decussation of the cerebellum. This decussation i
. The Journal of comparative neurology and psychology. Fig. 9. Three sagittal sections of the tectum of Scyllium stellare. A, nearlymedian, showing the greatest extent of the nucleus tecti. B, through thelateral part of the aqueduct. The mesencephalic bundle is seen passingbeneath the trochlearis. C, farther laterad. The fibers of the decussatio veilturn downward and forward as the tertiary gustatory tract. The radixmesencephalica passes caudad on the inner surface of the acusticum. X 16. Johnston, The Radix MesencephaUca Trigemini. 6ii or deep decussation of the cerebellum. This decussation in all sub-mammalian forms studied is the commissure of the nucleus visceraliscerebelli (secondary gustatory nucleus). The radix also runs beneaththe tractus tecto-cerebellaris, which I have identified in the selachians,. Fig. 10. Three sections from the same series as those drawn iu Fig, 9, butfarther laterad. Only the mesencephalic bundle and its immediate surround-ings are drawn. At D it comes into contact with the bundles of the motorroot of the trigeminus, at E it is passing beyond the motor bundles, at F itjoins the tractus spinalis trigemini to form the sensory root. The mesen-cephalic bundle crosses the motor Ijundles nearly at right angles and there isno indication of interchange of fibers. X ^^• Acipenser, and the mammals studied including the human course of the bundle in Scyllium canicula, Acipenser and tec-tums was described in my previous paper. I wish to make certainadditional notes on the basis of preparations made since that paper 6l2 Journal of Comparative Neurology and Psychology. was published. In Scyllium canicula the course of the radix mesen-cephalica through the ccrebelhun was somewhat complex and I sug-gested that this accounted for Edingers mistaking this bundle
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