Plate 1

A, G, Hippasteria trojana sp. nov.; A, adambulacrals 5 to 7 and associated structures; G, superomarginals 4 and 5. B, Anthenoides granulosus Fisher, adambulacrals 23 and 24, showing enlargement of sub-ambulacral spines. C, Plutonaster knoxi sp. nov., adambulacrals 6 to 8, and adjoining structures. D, E, Benthopecten pentacanthus sp. nov.; D, oral, adambulacral and inferomarginal plates; E, aboral aspect of holotype. F, H, Cheiraster richardsoni sp. nov.; F, oral, adambulacral, intermediate and inferomarginal plates; H, four single and one double paxillar florets, with an abactinal pectinate pedicellaria.