(from the article `cnidarian`) ...those of hydroids, hydrocoral skeletons are composed of calcium carbonate and are internal by virtue of being shallowly penetrated by channels of ... ...with gonads on stomach walls or radial canals. Polyps solitary or colonial, commonly with 1 or 2 tentacles, and no skeleton. Mostly ... [2 related a...
Found on
http://www.britannica.com/eb/a-z/m/92
Milleporina is an order of marine hydrozoa with the hydroid colony on the surface of a massive calcareous corallum perforated by pores into which the polyps can be retracted.
Found on
http://www.probertencyclopaedia.com/browse/BM.HTM
No exact match found.
