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Acanthella corrugata. Whole sponge, viewed olbiquely from above.
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Esperiopsis quatsinonensid (found on the sea-beaches of Alaska).
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Acanthella corrugata. From a section vertical to the surface and radial to the margin; below extreme marginal region. Mesial part of lamella and one surface are shown.
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Tetilla laminaris. Side view of a small specimen.
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Acanthella corrugata. Section vertical to the surface and radial to the margin; including margin and both surfaces of the sponge.
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Microciona prolifera. Older, branched form.
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Microciona prolifera. Incrusting specimen, with lobes; on oyster shells.
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Microcoiona prolifera.
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