A. E.  Verrill, ?Addition to the Tunicata and Molluscoidea of the Bermudas.?, Tranactions of the Connecticut Academy of Science, vol. 10, pp. 588-594, 1900.

W.  Michaelsen, ?Die holosomen Ascidien des Magalhaenisch-Sudgeorgischen Gebiet?, Zoologica, vol. 12, pp. 1-148, 1900.

W. E.  Ritter, ?Some ascidians from Puget Sound. Collections of 1896?, Annals. New York Academy of Science, vol. 12, pp. 589-616, 1900.

C. P.  Sluiter, ?Tunicaten aus dem Stillen Ocean?, Zoologische Jahrbuecher Abteilung fur Systematik Oekologie und Geographie der Tiere, vol. 13, pp. 1-35, 1900.