I Have for several years taken much interest in the reproduction of the naked-eyed Medusæ, and have endeavoured to obtain the polypoid larvæ of these creatures ; hitherto, however, with very indifferent success, having only succeeded in hatching two, Æquorea vitrina and Furris neglecta. Various species of Thaumantias swarm in the Firth of Forth, near Edinburgh, but when confined they almost invariably “cast” their ova, which never become developed into planuloid larvæ. This summer I have succeeded in obtaining the polyps in the following manner.

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