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The fatty acid composition of the lipids from the sponge Hymeniacidon sanguinea was investigated and 73 acids were identified. Three of them were new and their structures, elucidated by gas chromatographyymass spectrometry, were identified as 13-methyl-icosanoic, 15-methyl-docosanoic and 3,13-dimethyl-tetradecanoic. Only 12 sterols were present, with cholestanol predominating in the volatile fraction; 22 compounds were identified, mainly hydrocarbons and fatty acids. In the n-butanol fraction, we found mainly nitrogen-containing compounds. The compositions of sterols and lipids in the sponge collected from two locations with different ecological conditions (Canary Islands and Black Sea) were compared. ᮊ

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The fatty acid composition of the lipids from the sponge Verongia aerophoba was investigated and 60 acids were identified. Two of them were new and their structures were elucidated by gas chromatography-mass spectrometry. These acids were identified as 20-methylhexacosanoic and ∆5,9,22-nonacosatrienoic. Only 13 sterols were present, and aplysterol predominated. In the volatile fraction 13 compounds were identified, mainly fatty acids, their esters and hydrocarbons, while in the n-butanol fraction we found mainly free fatty acids and free amino acids.