Abstract
Abstract 1. 1. The detailed biochemical composition of the epidermis and cuticle from the foregut in Carcinus maenus has been examined. 2. 2. The cuticle was composed mainly of protein and chitin with a relatively small lipid component whilst the epidermis was rich in both protein and lipid. 3. 3. The sterol fractions of both tissues were composed almost entirely of cholesterol but the component phospholipids were quite distinct. 4. 4. The phospholipids of the epidermis were composed mainly of long chain, highly unsaturated fatty acids, whilst those of the cuticle were dominated by short-chain saturated fatty acids. 5. 5. These compositional differences are discussed in relation to the likely permeabilities of the tissues.
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