This paper gives descriptions of zoanthids collected from coral reefs and shores of the Hawaiian Islands between June 1965 and June 1967. Isaurus elongatus Verrill (1928) and Palythoa tuberculosa Esper (1791) are redescribed and Zoanthus westitus Verrill (1928) is reclassified as Palythoa westitus. Zoanthus confertus Verrill (1928) and Z. nitidus Verrill (1928) are combined under the new species name Zoanthus pacificus. New species described are P. psammophilia, P. toxica, and Z. kealakekuaensis.
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