In working through the literature of Cretaceous Cribrimorph Polyzoa, it has been found necessary to determine the significance of the genera under which the different Cretaceous species have been placed by various authors, and, consequently, the genotypes of these genera. In several cases where a genus has been founded upon more than one species, apparently no subsequent author has definitely chosen a genolectotype from the several genosyntypes at his disposal; it has, therefore, seemed desirable to publish a list of certain genera under which various authors have placed Cretaceous Cribrimorph forms, namely those of which the genotype is or has been in doubt. It is hoped thus to simplify the work of future authors and to reduce to less confusion the somewhat chaotic use of certain names.