Stereospecific triglyceride analyses were performed on fats of the following animals: five aquatic invertebrates, five freshwater fish, six marine fish, three marine birds, two amphibia, two seals, a whale, and a marine turtle. The distribution of faty acids was asymmetrical in most cases. A formula is presented which describes the general tendencies of fatty acid distribution in many animal fats, and some special rules which modify this formula are stated.

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Twenty genera of sponges from the class Demospongiae have been examined for fatty acid composition. All contain unusually high levels (34–79%) of C24−C30 fatty acids not generally found in other organisms. These characteristic “demospongic acids” are mostly polyunsaturated.