GIGANTOPRODUCTUS EDELBURGENSIS (PHILLIPS) AND RELATED SPECIES

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Abstract
Summary: The study of several collections of large, coarsely-ornamented productids shows that three species may be distinguished. Gigantoproductus edelburgensis has a moderately thin shell, and is confined to P 1a —P 1c horizons; G. cf. moderatus has a characteristic shape and is only known from P 1c horizons in North Wales; Semiplanus fragilis sp. nov., with a very thin shell, is limited to reef-limestones of B 2 —P 1a age. The analysis of shell form in terms of growth-spirals is attempted, and shows significant differences between the species; it is concluded that S. fragilis is not very closely related to the other two species. The holotype of G. edelburgensis is described, the variation is given for each assemblage, and limits suggested for the species.

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