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abactinal abactinal system aboral view actinal actinal plates adambulacral armature Adoral plates Agassiz Amblypneustes ambulacral arm-spines Asterina Backstairs Passage basal base of arm blunt brittle-star brown cirri conspicuous diameter distal distal margin diversity dorsal fathoms five flattened four genus granules H. L. Clark inferomarginals interbrachial areas interradial Kangaroo Island Lamarck larger largest specimen less locality label madreporite marginal plates Mortensen nearly white Northern Territory Ophiocomina Ophiothrix oral papillae Oral plates oral shields oral surface oral view ovum pale paratype pedicellariae periproct peristome pinnules plateia plates carry Port Willunga primary spines proximal radial shields rays segments Side arm-plates small specimens smaller smallest specimen South Australian species Spencer and St Spencer Gulf Spencer or St spinelets spines stout superomarginals taken by Dr tentacle-scales Troschel tubercles Tumby Bay Uniophora Upper arm-plates Verco collections view of holotype Vincent Gulf wider than long Zool