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OGAWA C., MOTOKAWA T., ISHIDA H. & MATSUNO A. (2000) Glycerinated catch apparatus of sea urchin spine : the effects of cations on its mechanical properties and ultrastructure. Zool. Sci., 17, p.603-608.

OKAZAKI  K. (1975) Normal development to meta­morphosis, pp. 177-232. In G. Czihak (ed.). The Sea Urchin Embryo. Springer-Verlag, Berlin, Germany.

OKAZAKI K., DILLAMAN R.M. & WILBUR K.M. (1981) Crystalline axes of the spine and test of the sea urchin Strongylocentrotus purpuratus: Determination by crystal etching and decoration. Biol. Bull. 161:402-415.

OLSON R.R., CAMERON J.L. & YOUNG C.M. (1993) Larval de­velopment (with observations on spawning) of the pencil urchin Phyllacanthus imperialis: a new intermediate larval form? Biol. Bull. 185:77-85.

ONODA K. (1931) Notes on the development of Heliocidaris crassispina with special reference to the larval body. Memoirs of the College of Science, Kyoto Imperial University, Series B 7:103-134.

ONODA K. (1936) Notes on the development of some Japanese echinoids with special reference to the structure of the larval body. Japanese Journal of Zoology 6:637-654.