. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. SAKGEXT: the optic EEFLEX ArPAKATUS OF VERTEBRATES. 213 along the median ventral groove of the torus, but mostly at the anterior end. This is shown in Figure 55, where numerous fine axons (/as. lieis.) from the cells of the torus are seen entering the ventricle in the median groove of the torus-lobes. As development proceeds, the separate axons become aggregated into bundles. In the adult the axons enter the groove as five or six bundles (Fig. A", frt. tor. fbr. Reis. p-), "which, running ventrad and caudad,
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. SAKGEXT: the optic EEFLEX ArPAKATUS OF VERTEBRATES. 213 along the median ventral groove of the torus, but mostly at the anterior end. This is shown in Figure 55, where numerous fine axons (/as. lieis.) from the cells of the torus are seen entering the ventricle in the median groove of the torus-lobes. As development proceeds, the separate axons become aggregated into bundles. In the adult the axons enter the groove as five or six bundles (Fig. A", frt. tor. fbr. Reis. p-), "which, running ventrad and caudad, unite with a similar bundle from the opposite ''cnd. Figure J. Tautogolabrus adspersus, adult. Diagrammatic transverse section of the anterior median dorsal portion of the mesencephalon and torus longitudi- nalis, through tlie posterior commissure. The end apparatus of Eeissner's fibre is projected on a plane. (In this figure, for trt. lor. fbr. Reis. a., read trt. tor. fbr. Reis. p., and vice versa.) For meaning of abbreviations, see Explana- tion of Plates, p. 257. The cells from the more lateral and anterior portion of the torus send their axons into the ventricle through the posterior commissure or just anterior to it. In young larvae before the development of the commis- sure this is the shortest path to the ventricle (Fig. 56, trt. for. fbr. Reis. a.), and the axons penetrate to the ventricle as a rule singly. As. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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