The elasmobranch fishes . elasmobranchfish03dani Year: 1934 THE ELASMOBRANCH FISHES 267 From an external view the eve is seen to be further protected by the orbit and in a way by upper and lower membranous lids. In Chlamydoselachus the lower lid is a deep fold which is interesting because a part of its inner surface is covered witli placoid scales. Tlie same is true of Mustelus. In fact it was from the possession of scales that the lower lid was formerly incorrectly supposed to be a newlv formed structure.

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