22 G. o. sars. [No. 7. 



was collected from a fresh-water lagoon, called „Malchi" — 3 

 miles from G-racemere. In the same aquary, too, was hatched a 

 specimen of DiapJumosoma incisum, described by the author in a 

 previous paper, as also one of the species of Lynceidse, described 

 below (Alona Uvissima). Dana collected this species in a fresh 

 water pool near Sidney, and it is highly probable that King too 

 has observed the same species in the vicinity of that town. 



3. Simocephalus Elizabethae, (King). 



(PI. 2, figs. 6-7). 



Baphnia FJizahcthce, King, On some of the species of Daph- 

 nidse found in New South Wales. Papers and Proceedings of 

 the Royal Society of Van Diemens Land. Vol. II, Part II, p. 

 247, PL II (ex parte). 



Specific Characters.— $. Carapace, as seen laterally, broadly 

 ovate, slightly dilated in its posterior part and terminating with 

 a distinctly defined though obtuse median prominence; superior 

 edge sharply curved posteriorly, inferior edges sinuated in the 

 middle. Head obliquely triangular, front narrowly rounded, with 

 the ventral edge concaved and joining the rostral projection 

 without any intervening notch. Shell obliquely striated, posterior 

 part of dorsal edge finely denticulate. Ocellus having the ap- 

 pearance of an elongate black stripe running obliquely towards 

 the rostrum. Tail narrower than in the preceding species, sn- 

 praanal angle projecting and finely denticulate, caudal claws 

 smooth, anal denticles on eit her side about 6. Colour pale chest- 

 nut, somewhat darker dorsally, valves with small irregular pat- 

 ches of a bright yellow. Length of adult female 1,54 mm. 



Remarks. — Although Mr. King would seem to have con- 

 founded several distinct species under this name, I think, at least, 

 that the form figured by him on PI. H, as the one more gene- 

 rally met with, may be the present species, which should ac- 

 cordingly bear the name proposed by that author. To judge 

 from his description, it is, as above stated, highly probable that 

 he has also observed the preceding species, but regarded it, 



