Daphnia

The recovery or death of the daphnia depends therefore on the issue of the struggle.

I have already spoken of the fresh-water shrimp and the water-flea (Daphnia pulex).

Of Crustaceae: near the sea-shore a Pagurus existed in astonishing numbers, and in the sweet waters a Daphnia.

Some of these belong to the genus Daphnia, and differ from the species found in other situations by their glassy transparency.

Such small creatures as Daphnia pulex, Cyclops quadricornis and Rotifera should be introduced into ponds.