The fine structure and function of the anterior foregut glands of Cymatiumintermedius (Cassoidea : Ranellidae)

The fine structure of the salivary glands of Cymatium intermedius is descri bed. It is concluded that both the posterior acid secreting and anterior ac inous lobes are homologous with the salivary glands of other prosobranchs. At least six different types of secretion have been identified and their po ssible roles discussed. The anterior lobes secrete mucin and proteins belie ved to be enzymes, and the posterior lobes are specialized for acid product ion as well as secreting protein (probably a peptide toxin). The mechanisms of acid secretion and protection from damage to the snail before its relea se are also considered.