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RAMSBOTTOM, W. H. C. 1958. British Upper Silurian crinoids from the Ludlovian. Palaeontology, 1, 2, 106–115.
W. H. C. Ramsbottom A brief review of the crinoid fauna of the Ludlow formation is followed by the redescription of Eutaxocrinus maccoyanus (Salter) and Meristocrinus orbignyi (M'Coy). The following new species are described: Gissocrinus ludensis, Mastigocrinus bravoniensis, and Hapalocrinus quinquepennis. Pisocrinus cf. sphericus (Rowley) and Cicerocrinus spp. also occur in the fauna. The Palaeontological Association (Free Access)