New Acetylenic Acids from a Sponge of the Genus Stelletta

New Acetylenic Acids from a Sponge of the Genus <i>Stelletta</i> New Acetylenic Acids from the Marine Sponge <i>Stelletta </i>Species An Acetylenic Alkaloid from the Calcareous Sponge Leucetta sp. New Sesterterpenes from the Sponge <i>Smenospongia </i>sp. New Acetylenic Enol Ethers of Glycerol from the Sponge <i>Petrosia</i> sp. Three New Cytotoxic Metabolites from the Marine Sponge Plakortis halichondrioides Globostellatic Acids A−D, New Cytotoxic Isomalabaricane Triterpenes from the Marine Sponge <i>Stelletta globostellata</i> New 2-Methoxy Acetylenic Acids and Pyrazole Alkaloids from the Marine Sponge Cinachyrella sp. Stellettins L and M, Cytotoxic Isomalabaricane-Type Triterpenes, and Sterols from the Marine Sponge Stelletta tenuis New Acetylenic Compounds from the Stony Coral <i>Montipora </i>sp.