Assertion: polyp's skeleton | /r/HasProperty | corallum
Facets:
Source sentences:
text: The skeleton (corallum) is basically discoidal, conical, or cylindrical, with or without an external wall (epitheca) and radial disposed vertical plates or spines (septa), and usually with horizontal partitions that range from simple flat plates to different combinations of variously shaped plates and vesicles (tabulae and dissepiments).
text: The skeleton itself is also called coral.