On some of the species of Daphniadae found in New South Wales.

The animals which I am about to describe belong to the crustaceous genera, which have been placed by Muller, Latreille, and later writers in the great division of the Entomostraca. My attention was directed to the search for them by reading the admirable memoir of the British Entomostraca, (by Mr. Baird), published in 1849 by the Ray Society. As the forms and various particulars of the British species have been so fully detailed in that work,I shall endeavour, in describing the Australian species, to follow the example of so able a master.