W. A.  Herdman, ?Notes on British Tunicata with descriptions of new species. I. Ascidiidae?, Journal of the Linnean Society of London. Zoology, vol. 15, pp. 274-290, 1880.

W. A.  Herdman, ?Preliminary report on the Tunicata of the Challenger Expedition?, Proceedings of the Royal Society of Edenburgh, vol. 10(1), pp. 458-472, 1880.