A.  Oka, ?Ueber eine Cystodites-Art aus Japan?, Proceedings of the Imperial Academy, Tokyo, vol. 5, pp. 480-482, 1929.

A.  Oka, ?Ueber eine neue gestielte Monascidie Podocynthia turboja n.g. n.sp.?, Proceedings of the Imperial Academy , Tokyo, vol. 5, pp. 94-96, 1929.

A.  Arnback-Christie-Linde, ?Chilean Tunicates. Ascidians from the Guaitecas Islands?, Arkiv for Zoologi, vol. 21A, no. 6, pp. 1-26, 1929.

A.  Oka, ?Eine zweite japanische Art der Gattung Agnesia?, Proceedings of the Imperial Academy of Japan, vol. 5, pp. 152-154, 1929.