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Dichelaspis Darwinii was found by Filippi in the branchial cavity of Palinurus vulgaris, and I have met with another species of the same genus in the branchial cavity of Lupea diacantha. The same thing may have taken place in primitive times.
Now in three species of Lepas, in Dichelaspis Warwickii and in Scalpellum Peronii, Darwin saw, on tearing recently-affixed animals from their point or support, that a long narrow band issued from the same point of the antennae; its end was torn away, and in Dichelaspis, judging from its ragged appearance, it had attached itself firmly to the support.
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