28 FRESHWATER ENTOMOSTRAGA OP N.S.W. 1. CLADOCERA, 



DAPHNIDAE. — Daphnia lumholtzii Sars, Simocephalus australiensis (Dana), 

 S. elizabethae (King), Cerio daphnia cornuta Sars, Moina propinqua Sars. 



MACROTHRICIDAE. — MacrotJirix spinosa King, Ilyocryptus spinifer Her- 

 lick. 



CHYDORIDAE. — Leydigia australis Sars, Dunhevedia crassa King, Alona 

 archeri Sars, A. laevisshrm Sars, A. clatlirata Sars, Alonella diaphana (King), 

 A. karua (King-). 



South Australia. 



DAPHNIDAE. — 'Simocephalus australiensis (Dana), S. elisabethae (King), 

 Ceriodaphnia rotunda Sars. 



BOSMINIDAE. — Bosmina longirostris Muller. 



CHYDORIDAE. — Leydigia quadrangularis Leydig, Chydorus globosus Baird, 

 C. unispinus Henry. 



Western Australia. 



DAPHNIDAE.— ilfoM(a flexuosa Sars. 



Tasmania. 



DAPHNIDAE. — Daphnia carinata King, Simocephalus australiensis (Dana)^ 

 S. dulvertonensis Smith, Ceriodaphnia hakea Smith, C. planifrons Smith. 



BOSMINIDAE. — Bosmina geoffreiji Smith, B. tasmanica Smith, B. sorelU 

 Smith. 



MACROTHRICIDAE.— Ma.cro*7tr(j^ burstalis Smith. 



CHYDORIDAE. — Alonella nasuta Smith, A. propinqua Smith. 



Key to the families of Cladocera. 

 A. Antennae with dorsal rami four-jointed, ventral three-jointed. 



B. Antennules short, intestine with two hepatic caeca Daplmidae. 



BB. Antennules long, intestine without hepatic caeca. 



C. Antennules? fixed, ocellus absent Bosminidae. 



CC. Antennules freely movable, ocellus present Macrothrieidae. ■ 



AA. Rami of antennae both three-jointed Chydoridae. 



Family DAPHNIDAE Straus. 



Antennules small, one-jointed. Antennae with three- and four-jointed rami. 

 Eye large; ocellus small, sometimes absent. Five pairs of feet. Intestine not 

 convoluted. Ephippium well formed, containing one or two eggs. 



Key to genera of Daphnidae. 

 A. Rostrum present. 



B. Head crested Daphnia. 



BB. Head not crested-. 



C. Posterior margin of the carapace with two ventral spines 



Scapholeheris. 

 CC. Carapace ending posteriorly in a short spine or angle Simocephalus. 

 A A. Rostrum absent. 



B. Ocellus present, carapace completely covering the body, 



C. Head small, depressed Ceriodaphnia. 



CC. Head large, extended Moinodaphnia. 



BB. Ocellus absent, carapace not completely covering the body Moina. 



Genus Daphnia Muller, 1785. 

 Female. Body laterally compressed, with a median spine on the posterior 

 margin of the carapace. Head crested; not separated from the thorax by a 



