Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
A genus of simple, stony corals; -- so called because they areusually flat and circular, with radiating plates, like the gills of amushroom. Some of them are eighteen inches in diameter.
