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ambulacral plates Amphipholis Amphiura Antedon arm spines Azores Bathymetrical distribution Bay of Biscay body British seas calcareous Cape Verde ciliated coast Colour conspicuous covered Crinoids Danmark's Fauna Development unknown diameter of disk distal distinct Dorsal plates dorsal side echinoderms Echinoids elongate Faroe Channel fasciole flattened furrow spines genera genus granules Greenland H. L. Clark Holoth Holothurians Koehler larger larva lower marginals Lyman madreporite marginal plates Mediterranean Michael Sars Monaco mouth papillae Mouth shields Mrtsn N.E. Atlantic naked numerous occur Ophiura Ophiuroids Oral interradial oral side outer edge pair pedicellariae peristome Perrier pinnules pores posterior end primary plates Primary spines Princesse Alice proximal Radial shields rods Sars sea-stars seas this species side of disk Skagerrack skin Sladen slender species known spicules Talisman tentacle scales Theel transverse Troschel tube-feet tubercles upper usually valves ventral plates ventral side Verrill