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A difference of possible physiological significance is reported in the chemical nature of the green integumentary pigment of the echiuroid Bonellia viridis, the proboscis of which contains the known bonellin ( 1, R=H) as the major constituent, while the body skin is mainly pigmented by an isoleucine conjugate, neobonellin, formulated tentatively as 2 (R=H) by spectral and chemical data. [ABSTRACT FROM AUTHOR]

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The structures of 2 minor constituents of the marine sponge Dysidea avara, which induce developmental aberrations in sea-urchin eggs, are described. The structures were confirmed also by a simple synthesis from avarol ( 1). [ABSTRACT FROM AUTHOR]