For a number of years the author and his collaborators have been engaged in a systematic comparative study of the fatty constituents of marine invertebrates. So far special attention has been devoted mainly to the unsaponifiable fractions of such fats, in particular to the sterols which they contain. Work on the phosphatide fractions of invertebrate fats and their saponifiable components is now in progress and will be discussed in a future publication.
Bergmann, Werner. 1949. "Comparative biochemical studies on the lipids of marine invertebrates, with special reference to the sterols." Journal of Marine Research 8, (2). https://elischolar.library.yale.edu/journal_of_marine_research/711