A new genus and species, Leioplegma polyphyllon, of the hexactinellid family Aulocalycidae is described from nearly undamaged fragments collected by submersible from the ship-wreck of the S.S. Central America. Proposed re-diagnosis of the family stresses as its basic feature
the formation of primary dictyonal strands from single hexactin rays and returns this group to Ijima's original concept.
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