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Alder, J. & A. Hancock 1907. The Brithish Tunicata: an unfinished monograph, volume II, edited by J. Hopkinson. Ray Scoiety, London.

Berril, N.J. 1950. The Tunicata, with an account of the British species. Ray Society, London. 354 pp.

Knight-Jones, E.W. & J.S. Ryland 1990. Hemichordata and Urochordata. In: P.J. Hayward & J.S. Ryland (eds), The Marine Fauna of the British Isles and North-West Europe, vol. 2 Molluscs to chordates, Clarendon Press, Oxford: 872-904.

Millar, R.H. 1966. Tunicata Ascidiacea. Marine invertebrates of Scandinavia, 1: 1-123.

Millar, R.H. 1970. British Ascidians. Synopses of the British Fauna, N.S 1, 1-92.

Berril, N.J., 1950. The Tunicata, with an account of the British species. Ray Society, London. 354 pp.

Clavelina lepadiformis