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Cyrtoceras

CYRTOCERAS The shell is strongly curved in an open hook shape and nearly circular in cross section. The posterior part is made up of numerous closely spaced chambers, while the long-living chamber makes up the anterior part of the shell. Habitat: Experiments suggest that the animal lived head-down in the water, probably near the bottom of the sea. It was able to swim and adjust its bouyancy. Remark: The specimen featured is an internal mold, from which the original shell has been completely lost. © 1992 Cyril Walker, David Ward .