rectum. This ascends towards the anus, which projects from a small, conical protuberance at the edge of the tegmen. Faecal matter is formed into large, mucous-cemented pellets, which fall onto the tegmen and thence the substrate.

Predation

Specimens of the sea urchin Calocidaris micans found in the vicinity of the crinoid Endoxocrinus parrae have been shown to contain large quantities of stem portions in

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