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Pleurocystites ( Cystoid )

Ptilodictya-sea mat This well-preserved specimen displays very clearly the large plates on the upper surface of the theca, and the rather short, rapidly tapering, coiled stem. The stem is broad and flexible close to the theca and composed of alternately large and small ossicles. Two long brachioles extend on either side of the centrally placed mouth. HABITAT Pleeurocystites was a benthonic, filterfeeding organism. Copyright 1992 Dorling Kindersley Limited, London Text copyright 1992 Cyril Walker, David Ward. .