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A division of nudibranchiate Mollusca, in which the gills form a wreath or cluster upon the posterior part of the back.

The whole surface of the body becomes greatly modified in those Nudibranchiate forms which have lost, not only the shell, but also the ctenidium.

His Balkan studies are as supremely competent as his monumental work on British Nudibranchiate Mollusca, published by the Ray Society when Sir Charles, having resigned the Governorship of East Africa, was Vice-Chancellor of Sheffield University.

Among the creatures which probably have warning colours as a sign of inedibility are, the brilliantly coloured nudibranchiate molluscs, those curious annelids the Nereis and the Aphrodite or sea-mouse, and many other marine animals.

Such are the tints of the beautiful nudibranchiate mollusc, Glaucus atlanticus, and many others.