1. HIROTA, R. (1959): On the morphological variation of Sagitta crassa. (In Japanese with English abstract) Jour. Oceanogr. soc. Japan, 15, 191-202.
2. KADO, Y. (1950): The seasonal change of plankton of the neighbouring sea of Mukaishima. (In Japanese; Bull. Biol. Soc. Hiroshima Univ., 2 (2), 12-19.
3. KADO, Y. (1953): Copepods fauna of the Inland Sea of Japan. (In Japanese) Ibid., 5 (1), 29-30.
4. KADO, Y. (1954a): The seasonal change of plankton and hydrography of the neighbouring sea of Mukaishima. Jour. Sci. Hiroshima Univ., Ser. B, Div. 1, 15, 193-204.
5. KADO, Y. (1954b) Notes on the seasonal variation of Sagitta crassa. Annot. Zool. Japan., 27, 52-55.