A clutch of 12 eggs and numerous eggshell fragments recovered from the Oldman Formation at Devil's Coulee, southern Alberta, are described as Prismatoolithus levis oosp.nov. The eggs are elongate with a smooth outer surface and an eggshell structure that is referable to the angustiprismatic morphotype of the dinosauroid-prismatic basic type. The parataxonomy of Prismatoolithus Zhao and Li, 1993, is discussed and a new replacement name Preprismatoolithus is proposed for the junior homonym Prismatoolithus Hirsch, 1994.

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