Three new bromo-substituted alkaloids, flustramine C and flustraminol A and B, have been isolated from the marine bryozoan Flustra foliacea (L.). The structures have been elucidated by using spectroscopic methods. In continuation of a study of brominated alkaloids from the marine bryozoan Flustra foliacea (L.), we report the isolation and structure elucidation of three new alkaloids, flustramine C (1), flustraminol A (2), and flustraminol B (3). These structures seem, at least formally, closely related to flustramine A (4) and flustramine B (5). Like flustramine A (4) and B (5), the structures encompass the basic 6-bromo-substituted physostigmine skeleton; however, in contrast to 4 and 5 they only have one isoprene substituent. In the case of 1 and 2 this substituent is the rarely encountered inverted γ,γ-dimethylallyl (2-methyl-3-buten-2-yl) and in 3 the normal γ,γ-dimethylallyl (3-methyl-2-butenyl) substituent. Structures 1-3 all represent a 2-equiv-higher oxidation state than 4 or 5.