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The octocoral Swiftia exserta has been utilized extensively to study innate immune reactions in cnidaria such as wound healing, autoand allo-graft reactions, and some classical “foreign body” phagocytosis experiments. All of these reactions occur in the coenenchyme of the animal, the colonial tissue surrounding the axial skeleton in which the polyps are embedded, and do not rely on nematocysts or directly involve the polyps. To better understand some of the cellular reactions occurring in the coenenchyme the present study employed several cytochemical methods (Periodic-acid Schiff’s reaction, Mallory’s aniline blue collagen stain, and Gomori’s trichrome) and correlated the observed structures with electron microscopy (both scanning and transmission) and light microscopy. Eight types of cells were apparent in the coenenchyme of Swiftia exserta, exclusive of gastrodermal tissue: 1) ectoderm epithelia, 2) oblong granular cells, 3) granular gland cells, 4) granular amoebocytes, 5) small mesoglea cells, 6) axial epithelia, 7) cnidocytes with macrobasic amastigopore nematocysts, and 8) cnidocytes with atrichous isorhiza nematocysts. Several novel organizational features are now

Aspects of the Innate Immune System in the Caribbean Octocoral Swiftia exserta