A study of the plankton in the Suez Canal could throw some light from the explanatory point of view, on the distribution of the planktonic forms of the two different water bodies of the Mediterranean and Red Sea. From the fisheries point of view, the plankton study is indispensable to seek out the relation between the abundance and movement of fishes and the fluctuations in the plankton; both in quantity and quality at different times, places and depths.

This historical collection consists of 150 specimens and it is of particular interest since it is the first to be taken from the waters of the Eastern Mediterranean. The main point of importance brought out by the present investigations is that there are definite signs of an immigration of sponges from the Red Sea and Indian Ocean.