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A. G.  Huntsman, ?Ascidians from the coasts of Canada?, Transactions of the Royal Canadian Institute, Annals, vol. 9, pp. 111-148, 1912.

R.  Hartmeyer, ?Die ascidien der Deutschen Tiefsee-Expedition.?, Deutschen Tiefsee Expedition, vol. 16, pp. 225-392, 1912.

W.  Michaelsen, ?Die Tethyiden (Styeliden) des Naturhistorischen Museums zu Hamburg nebst Nachtrag und Anhang, einige andere Familien betreffend?, Mitteilungen aus dem Naturhistorishen Museum in Hamburg, vol. 28, pp. 109-186, 1912.

C. P.  Sluiter, ?Les ascidies de l?Expedition Antarctique Francaise du Pourquoi-pas? comandee par le Dr.Charcot 1908-1909.?, Bulletin du Museum National d?Histoire Naturelle, Paris, vol. 18, pp. 452-460, 1912.

W. G.  Van Name, ?Simple ascidians of the coasts of New England and neighboring British provinces?, Proceedings of the Boston Society of Natural History, vol. 34, pp. 439-619, 1912.