Rugosa
in zoölogy, a group of Madreporaria; corallum sclerodermic with a true theca; generally both tubulæ and septa combined; septa generally some multiple of four, but with one or three prominent, or with a small channel; simple or con pound corals represented in the modern seas only by two genera, one from the Mediterranean, the other from Florida. Families: Stauridx, Cyathaxonidæ, Cyathophyllidæ, and Cystiphyllidæ. Also found in the Palæozoic rocks, the Upper Greensand, and the Tertiary.
They were reef-builders.
RUHR (rör), a river of Prussia, that joins the Rhine at Ruhrort, about 15 miles N. of Düsseldorf. It rises in Westphalia, and has a tortuous course of about 200 miles, latterly through the Ruhr coal field region.
Germany,