SOME AUSTRALIAN FRESHWATER COPEPODA AND OSTRACODA. 45 



The carapace is an orange-brown colour with darker 

 brown markings. In the living animal the dark greenisli 

 intestine and orange coloured ova can be seen through the 

 carapace. The structure of the oral parts is that charac- 

 teristic of the genus. 



The anterior leg (fig. 15) has a long, curved, denticulated 

 terminal spine. 



The caudal rami (fig. 14) are of moderate length; they 

 taper slightly distally, and are armed with two unequal 

 claws and two bristles; both the claws are finely denticu- 

 lated for the outer two-thirds of their length ; the larger 

 exceeds half the length of the ramus. 



This species most nearly resembles Cyprinotus dahli y 

 Sars, described by Sars in his paper "On Some West- Aus- 

 tralian Entomostraca." (32) It differs from this smaller form 

 in its general shape, and in having a ventral as well as a 

 dorsal projection of the right valve. It also differs in the 

 fine denticulation of the caudal claws. 



Specific Characters. — Carapace, seen laterally, oval in 

 form, greatest height occurring about the middle; dorsal 

 margin boldly arched, ventral slightly convex; anterior 

 extremity obliquely rounded. Seen from above rather 

 tumid, anterior extremity narrower than the posterior. 

 Valves of unequal size, the left one slightly overlapping 

 the right at the extremities, but overlapped by projections 

 of the right valve, both dorsally and ventrally. Surface 

 of the carapace smooth, sparsely hairy at the extremities. 

 Oral parts normal. Caudal rami tapering slightly distally r 

 terminal claws denticulated, outer claw exceeding half the 

 length of the ramus. Colour orange-brown, marked with 

 darker brown. Length 2 mm. 



Collected at Botany in July. Type specimen in the 

 Australian Museum, No. P 4341. 



