It is asserted upon the authority of Science, and upon evidence, which is this time not merely a fiction of theoretical speculation, that many of the animals—especially among the lower orders of the vertebrata—have a _third_ eye, now atrophied, but which was necessarily active in its origin.(676) The Hatteria species, a lizard of the order Lacertilia, recently discovered in New Zealand—_a part of ancient Lemuria so called, mark well_—presents this peculiarity in a most extraordinary manner; and not only the Hatteria Punctata, but the Chameleon, and certain reptiles, and even fishes. It was thought, at first, that this was no more than the prolongation of the brain which ended with a small protuberance, called Epiphysis, a little bone separated from the main bone by a cartilage, and found in every animal. But it was soon found to be more than this. As its development and anatomical structure showed, it offered such an analogy with that of the eye, that it was found impossible to see in it anything else. There are Palæontologists who to this day feel convinced that this Third Eye originally functioned, and they are certainly right. For this is what is said of the Pineal Gland in Quain’s _Anatomy_: It is from this part, constituting at first the whole and subsequently the hinder part of the anterior primary encephalic vesicle, that the optic vesicles are developed in the earliest period, and the fore part is that in connection with which the cerebral hemispheres and accompanying parts are formed. The thalamus opticus of each side is formed by a lateral thickening of the medullary wall, while the interval between, descending towards the base, constitutes the cavity of the third ventricle with its prolongation in the infundibulum. The grey commissure afterwards stretches across the ventricular cavity.... The hinder part of the roof is developed by a peculiar process to be noticed later into the pineal gland, which remains united on each side by its pedicles to the thalamus, and behind these a transverse band is formed as posterior commissure. The lamina terminalis (lamina cinerea) continues to close the third ventricle in front, below it the optic commissure forms the floor of the ventricle, and further back the infundibulum descends to be united in the sella turcica with the tissue adjoining the posterior lobe of the pituitary body.