Abstract
During the winter of 1886-87, while occupying the Cambridge table in the Zoological Station at Naples, I obtained an abundant supply of larvæ of Antedon rosacea in all the early stages of development. As I have had no opportunity of examining larvae from any other locality, the following description must be understood to refer solely to the Neapolitan form; for, though this and the British form are included under the common name of A. rosacea , it is possible that the discrepancies between Wyville Thomson’s account of the larva (21) and the one here given may indicate the existence of specific differences which have hitherto escaped notice.

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