74 On Australian Entomostracans. 



Order II. Copipoda. 

 Fam. I. 

 Cyclopid^. 

 Genus I. Cyclops. 

 1. C. Australis. 

 Locality ; — in all ponds. 



Fam. II. 



DlAPTOMID^. 



* Nearly transparent ; male larger than female. 



Genus. Diaptomus. 

 1. D. Pollux. Male spindle-shaped. 

 Locality ; — Parramatta. Sydney, &c. 

 S. D. uxorius. Male, clavate. 

 Locality ; — Port Stephens. 

 ** A deep red colour, male smaller than female. 



3. D. Maria. Last thoracic ring, in female, with pro- 

 cesses shorter than the abdomen. 



Locality ; — Denham Court. 



4. D. Cookii. Last thoracic ring with processes longer 

 than the abdomen. 



Explanation of Plates. 

 Plate IX. 



A. 1. — 12. Newnhamia fenestrata. 



1. Side view when walking. 



2. Ventral view of the female, showing the flat plate. 



3. Dorsal view of male, showing the eye tubercles. 



4. Ventral plate. 



5. Antenna. 



6. Antenna and eyes. 



7. Eye-tubercle much magnified. 



