SOME AUSTRALIAN FRESHWATER COPEPODA AND OSTRACODA. 41 



The colour of males and females is dark green with light 

 orange antennules and antennae and orange markings on 

 the abdomen. 



This species somewhat resembles Cyclops prasinus, 

 Fischer. The antennules, however, are straight and lack 

 the hinge of C. prasinus; the lateral caudal seta is situated 

 close to the end of the ramus instead of in the middle; the 

 colouring is distinctly green and orange instead of indigo 

 blue. 



Specific Characters. — Female with a moderately slender 

 body, cephalothorax oval. Genital segment equal in length 

 to the next two segments combined. Caudal rami divergent, 

 slightly longer than the last segment. Inner middle apical 

 seta twice as long as the outer. Antennules composed of 

 twelve segments, reaching when reflexed, to the base of 

 the cephalothorax. Natatory legs all tri-articulate. Fifth 

 pair of legs consisting of a lamella with a spine and two 

 setae. Ovisacs oval, slightly divergent. 



Collected at Kendall during both winter and summer 

 months. Type specimen in the Australian Museum No. 

 P 4339. 



Genus PLATYCYOLOPS, Sars. 

 Platycyclops phaleratus, Koch. 

 Syn. Cyclops canthocarpoides, Fischer, 0. lascivus, Pog- 

 genpol. 



This form was first described by Koch in " Deutschlands 

 Crustaceen, Myriapoden und Arachniden (15) in Heft 21, tab 

 D. It is described and figured by Sars in the "Crustacea 

 of Norway, (31) and by Marsh in "North American Species 

 of Cyclops."^ 



This species was found in abundance at Kendall during 

 the winter and summer months; it was also collected from 

 a pond in the University grounds in July. 



