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ROSS, J. R. 1965. Homotrypa and Amplexopora? from the Caradoc Series, Shropshire. Palaeontology, 8, 1, 5–10.
June R. Phillips Ross Additional bryozoan species from the Harknessella subquadrata horizon of the Hoar Edge Limestone, Evenwood Quarry, include unique inverted cone-shaped colonies of Homotrypa atveni sp. nov. and two species questionably assigned to Amplexopora, Atnplexopora? evenensis sp. nov. and Amplexopora? sp. A. The Palaeontological Association (Free Access)