Two new brominated toxic compounds, corallinafuran (1) and corallinaether (2), have been isolated from crustose coralline red algae (CCA). Their structures were elucidated based on a detailed analysis of spectral data. Compounds 1 and 2 showed toxicity against larvae of the scleractinian coral Pseudosiderastrea tayamai, with LD99 values of 1.9 and 0. 14 mu g/mL, respectively.