Abstract
GENERALLY in Selachii, between the nasal and auditory capsules, on each side, are the orbits in which the eyes are lodged. The orbit is overhung by the supraorbital cartilage which extends anteriorly and posteriorly to the orbit as the pre- and post-orbital processes respectively. The optic capsule, which is represented by the sclerotic cartilage, does not fuse with the brain-case, as the nasal and auditory capsules do; but it is held away from the orbital wall by the cartilaginous optic stalk, which is proximally fused with the orbital wall.
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