Abstract
The work embraces the results of the systematic examination, for fossil micro-organisms, of slides prepared from ironstones and ferruginous limestones from various districts of Great Britain.Abundant traces were found in the Frodingham Ironstone of a fossil fungus allied to the modern Phycomycetes. This is named Phycomycites Frodinghamii. The traces include hyphæ, sporangia, and spores. These are described, measured, and photographed, and details of the life-history, so far as ascertainable, are given.

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