alveolate, [456];

pectinate, [456];

pincer-shaped, [456];

valvate, [456];

forcipulate, [433], [434], [456], [462];

representatives in Ophiuroidea, [492];

in Ophiothrix fragilis, [492];

in Ophiohelus, [492], [493];

of Echinus acutus, [509];

of E. esculentus, [506] f., [507];