. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 274 COMPARATIVE ANATOMY A chiasma, that is, a crossing of the fibres of the two optic nerves, doubtless always occurs though not always freely exposed, for it may retain a primitive position deeply embedded in the base of the brain ( Myxinoids, Dipnoans, and to a certain extent in Petromyzon). In most Teleosts the optic nerves simply overlie one another (Fig. 202, A), but in some of these Fishes (Clupea (B), Engraulis), one nerve passes through a slit in the other, and r/i. jf. Please note that these images are extrac
. Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. 274 COMPARATIVE ANATOMY A chiasma, that is, a crossing of the fibres of the two optic nerves, doubtless always occurs though not always freely exposed, for it may retain a primitive position deeply embedded in the base of the brain ( Myxinoids, Dipnoans, and to a certain extent in Petromyzon). In most Teleosts the optic nerves simply overlie one another (Fig. 202, A), but in some of these Fishes (Clupea (B), Engraulis), one nerve passes through a slit in the other, and r/i. jf. 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 Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, Macmillan and co. , limited
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