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-I •V EXPLANATION OF PLATE 1. D. LOWER PALEOZOIC ECIIINODERMATA AND ANNUL AT A. 1 TAXOCRINUS ORBIGNII (M c Coy). From High Thorns, Underbarrow, natural size. 2 EUCALYPTOCRINUS POLYDACTYLUS (M'Coy). Natural size, from Dudley. 3 ACTINOORINUS PULCHER (Salt). Part of large slab, from Nant-gwchwyd Uchaf, S. of Llangollen; natural size, shewing three perfect cups with their rays, attached to their columns, and some portion of the older columns. 4 GLYPTOCRINUS BASALIS (M c Coy). Natural size, from the schists of Alt y Anker. 5 CARYOCYSTITES DAVISI (M c Coy). Side view of specimen, natural size, from Coniston. 5 a Front view of ditto. 6 Undetermined Cystidean, natural size, from Coniston. 7 TETRAGONIS DANBYI (Salt sp.). From the Upper Ludlow Rock of Brigsteer, natural size. 7 a Portion of ditto, magnified four diameters. 8 Larger specimen, natural size. 9 Undetermined fossil, common in the Upper Ludlow rock of Kendal, shewing the hemispherical upper surface, and flattened base, with what seems a pedicle of attachment. 9 a Portion of surface magnified. 10 TRACHYDERMA? LA5VIS (M°Coy). From the fine Caradoc Sandstone of Acton Scot, natural size, and section. 11 SERPULITES DISPAR (Salt). Natural size from N. end of Benson Knot. 12 Ditto. 13 MYRIANITES TENUIS (M°Coy). From the slate of Greiston, on Tweed, natural size. 14 CROSSOPODIA LATA (M c Coy). Fragment, natural size, from the Tilestone of Storm Hill, Llandeilo. 15 CROSSOPODIA SCOTICA (M c Coy). From the slates of Thorny Lee, on the Tweed, natural size; the narrow markings being the trails left by the worms, the broader portions containing the body and fringe-like cirri, perfect.