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Updated: May 16, 2025
Thus it is probable that some four-gilled form was the progenitor of the dibranch cephalopods. Such being the case with regard to the organ of hearing, we have another yet stronger argument with regard to the organ of sight, as has been well pointed out by Mr. J. J. Murphy. In the cuttle-fishes we find an eye even more completely constructed on the vertebrate type than is the ear.
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