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The species found in the South Sea has no eyes, and plain feelers; on which account it was formerly considered by us as forming a distinct class, and called Eurydice. But, although the Phyllirhoe is found to vary so remarkably in its formation, owing to the want of feet, still I consider it as nearly allied to the Eolidia.
The effect of ammonia on the light emitted by the sea-slug Phyllirhoë bucephala, is also fully explained, ammonia being one of those alkaline substances which are so directly favorable to the exhibition of the phenomenon.
A more beautiful example of a phosphorescent mollusk is presented by a sea-slug called Phyllirhoë bucephala. This is a creature of from one and a half to two inches in length, without a shell in the adult stage, and without even gills. It breathes only by the general surface of the body.
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