Abstract

The subject of which the present communication is a brief preliminary account has occupied by attention during the last five years, and a full account will be published shortly. Meanwhile, a brief outline of the main results is given here. Ophiothrix fragilis is one of the commonest species of British Ophiuroidea. Especially in the neighbourhood of Plymouth, where the material for this research was obtained, this species is found in immense swarms, so that, on certain kinds of bottom, hundreds of individuals are brought up with each haul of the dredge. During the months of June and July it spawns, and on which it lives is full of its larvæ in all stages of development.

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