466 MARGUERITE HENRY. 
SIMOCEPHALUS AUSTRALIENSIS Dana. 
This species was first described by Dana, in the ‘‘U.S. 
Exploring Expedition,’’ Crustacea II, as Daphnia australi- 
ensis, A more extended description with good figures was 
later given by Sars in “Additional Notes on Australian 
Cladocera.’’‘18) 
This form was found in abundance at Kendall from 
October to June. A few specimens were obtained from a 
pond at Sydney University in June, and numerous ephippia- 
bearing specimens were collected at Corowa in March. 
This species has been recorded from South Africa, from 
Gracemere in Queensland, and from Sydney. 
SIMOCEPHALUS ACUTIROSTRATUS King. 
King first described this form in the Proc. Roy. Soc. Van 
Diemen’s Land.’ It was later more fully described by 
Sars in “Freshwater Entomostraca from the neighbour- 
hood of Sydney.’ “! 
A few specimens of this form were obtained at Casino in 
January. The size of these was smaller than is usual in 
this species, the largest specimen obtained being only 2 mm. 
long. King records this species from Denham Court, N.S. 
Wales, and Sars from a waterhole in Bourke Street, Sydney. 
Genus CHRIODAPHNIA’ Schocdice 
CERIODAPHNIA SPINATA Sp. nN. 
(Plate XL, figs. 1, 2.) 
The length of the adult female is1°2mm. ‘The carapace, 
seen laterally, is rounded oval in outline, dorsal and ventral 
margins are evenly curved, the posterior prominence very 
distinct and rather short pointed; it is situated above the 
middle axis of the body. 
The head, as compared with other species of the genus, 
is not very much depressed; it is distinctly marked off 
from the carapace dorsally by a comparatively deep groove. 
