Barrington, E. J. W., 1936, Proteolytic digestion and the problem of the pancreas in Lampetra: Proceedings of the Royal Society, London B, v. 121, p. 221-232.

---, 1938, The digestive system of Amphioxus ( Branchiostoma) lanceolatus: Philosophical Transactions of the Royal Society, London B, v. 228, p. 269-311.

Welsch, U., 1975, The fine structure of the pharynx, cryptopodocytes and digestive system of amphioxus (Branchiostoma lanceolatum): Symposium of the Zoological Society, London, v. 36, p. 17-41.

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