"rhamphotheca:  Calcareous Sponges - Plate 5 from Ernst Haeckel's Kunstformen der Natur ""Calcispongiae"", now called Calcarea, is a class of about 400 marine sponges that are found mostly in shallow tropical waters worldwide. Calcareous sponges vary from radially symmetrical vase-shaped body types to colonies made up of a meshwork of thin tubes, or irregular massive forms. The skeleton has either a mesh or honeycomb structure."
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