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T.  Nishikawa, ?Ascidians from the Gilbert and Solomon Islands and Nauru I.  Perophoridae, Ascidiidae, Corellidae?, Proceedings  of the Japanese Society of Systematic Zoology, vol. 32, pp. 30-78, 1986.

T.  Nishikawa, ?Ascidians collected in the vicinity of the Oga Peninsula, the Japan Sea?, Memoirs of the National Science Museum, no. 17, pp. 149-161, 1984.

T.  Nishikawa, ?Some ascidians collected in the vicinity of Shimoda, Izu Peninsula, middle Japan?, Memoirs of the National Science Museum, vol. 15, pp. 203-212, 1982.

T.  Nishikawa and Tokioka, T., ?Contributions to the Japanese ascidian fauna XXIX. Notes on some Clavelinids from the Japanese waters?, Publications of the Seto Marine Biological Laboratory, vol. 23, no. 1/2, pp. 63-82, 1976.

T.  Nishikawa and Tokioka, T., ?Contributions to the Japanese ascidian fauna.  XXVI. Notes on simple ascidians commonly found in the waters near the Sabiura Marine Park Research Laboratory?, Publications of the Seto Marine Biological Laboratory, vol. 22, no. 1/4, pp. 217-222, 1975.

T.  Tokioka and Nishikawa, T., ?Contributions to the Japanese ascidian fauna XXVII. Some ascidians from Okinawa, with notes on a small collection from Hong Kong?, Publications of the Seto Marine Biological Laboratories, vol. 22, no. 5, pp. 323-341, 1975.

T.  Nishikawa, ?Ascidians from the coast of Kii Peninsula, Middle Japan, with descriptions of two new species?, Memoires. National Science Museum (Japan), vol. 13, pp. 97-111, 1980.

T.  Nishikawa, ?The ascidians of the Japan Sea?, Publications of the Seto Marine Biological Laboratory, vol. 34, pp. 73-148, 1990.

T.  Nishikawa, ?Revision of the ascidian genus Herdmania (Urochordata: Ascidiacea) inhabiting Japanese waters?, Species Diversity, vol. 7, pp. 217-250, 2002.