Antitumor bioassay-guided fractionation of the organic extract of the marine sponge Cribrochalina vasculum resulted in the isolation of several closely related cytotoxic acetylenic alcohols [1-8], the structures of which were assigned on the basis of chemical and spectral studies. 3-Hydroxyeicos-(4E)-en-1-yne, 3-hydroxydocosa-(4E,15Z)-dien-1-yne, 3-hydroxy-16-methyleicos-(4E)-en-1-yne, 3-hydroxy-19-methyleicos-(4E)-en-1-yne, 3-hydroxy-21-methyldocosa-(4E,15Z)-dien-1-yne , and 3-hydroxy-14-methyldocosa-(4E)-en-1-yne  are enantiomers of known compounds, while 3-hydroxyheneeicos-(4E)-en-1-yne  and 5-hydroxy-16-methyleicos-(3Z)-en-1-yne  are new metabolites isolated as minor components. The absolute configuration of C-3 in 1-7 and C-5 in 8 has been assigned as S using the modified Mosher's method. Compounds selected from this series showed selective in vitro antitumor activity against the H-522 non-small cell lung line and the IGROV-1 ovarian line. Synthetic racemic 1 demonstrated a modest dose-related therapeutic activity in a preliminary in vivo xenograft assay based on the latter cell line.