72 On Australian Entomostracans. 



2. E. Cookii. Of a larger size than the rest ; of a deep 

 chocolate colour. 



Locality ; — Lagoon near Botany, Moreton Bay. 



3. E. Cuningliami. Deeply striate on the carapace in 

 three directions. 



Locality ; — Botanic Gardens, Sydney. 

 Genus IL Chydorus. 



1. C. Leonardi. Almost globular. The ephippial ova 

 placed side by side. 



Locality ; — Sydney. 



2. C. Augustus. Ova placed one above the other; a large 

 species. 



Locality ; — Sydney. 



Genus III. Alona. 



1. A. Bairdii. Setse of rami spinous, as in Macrothrix 

 sjpinosa. 



Locality ; — The Lachlan Swamps. 



2. A. pulchella. Anterior margin concave. 

 Locality ; — Denham Court, Sydney. 



3. A. diaphana. Anterior margin convex. 

 Locality ; — Sydney. 



4. A. Karua. Beak very much produced. 

 Locality ; — R. Karua, Port Stephens. 



6. A. mascula. First pair of legs having hooks like 

 Pleuroxus hamatus. (Baird.) 



Genus IV. Dunhevedia, (nov. gen.) 



The carapace oval, the anterior spine ending in a margin 

 directed downwards. 



