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Updated: October 2, 2026
"Lingula flags" of Dolgelly, and Ffestiniog; N. Wales. Hymenocaris vermicauda, Salter. A phyllopod crustacean. Lingulella Davisii, M'Coy. a. One-half natural size. b. Olenus micrurus, Salter. Next below the Tremadoc slates in North Wales lie micaceous flagstones and slates, in which, in 1846, Mr.