Abstract

Cyclospongia discus Miller, 1891, originally described as a species of sponge from the 'Corniferous' rocks of Bunker Hill, Indiana, is based on gastropod opercula. Study of the opercular shape and growth pattern suggests that it was associated with a helicoidal, depressed helicoidal, or planorbiform spiral shell that was probably between 48 and 53 mm in adult size. Cyclospongia is provisionally referred to the family Oriostomatidae (Archaeogastropoda, suborder Trochina). The exact collecting site near Bunker Hill is unknown, and the stratigraphic position of Cyclospongia is unknown; it is probably Devonian, but may be Upper Silurian in age.

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