1886. ] ENTOMOSTRACA FROM SOUTH AUSTRALIA. 87 
hard and dense, dark brown (one of the specimens has a broad 
white marginal band). Length ;°; of an inch; height ,,. 
Hab. Lake Bonney, River Murray, South Australia; also Fowler 
Bay, Great Australian Bight (Prof. R. Tate). 
Genus Evtrmnapta, Packard. 
(Limnadia, Brongniart, in part.) 
EULIMNADIA RIVOLENSIS, n. sp. (Fig. D.) 
Shell membranous, without any lines of growth; seen from the 
side, subovate, highest toward the front ; anterior extremity broadly 
rounded, posterior narrow, very slightly rounded ; dorsal margin well 
arched, almost gibbous, ventral slightly convex ; the dorsal aspect is 
compressed, ovate, more than thrice as long as broad, tapered and 
acuminate behind, somewhat more obtuse in front. Length 3,8, of 
an inch ; height ;?2;, width ,1°,. 
Very similar to Limnadia antillarum, Baird, but much larger ; 
differs also in having the eye near the middle of the anterior margin 
instead of near the dorsal angle, in being without any distinct lines 
of growth, and in having an evenly rounded (not angulated) anterior 
margin. This species was found by Prof. R. Tate in company with 
Limnetis tatei. 
Inside the valves of a specimen of this Hulimnadia I found on 
dissection a large colony of a protozoon, possibly Arcella dentata, 
Ehrenberg, at any rate very closely resembling that species, as 
figured by Professor Leidy. 
Family Arpop1p 4, Burmeister. 
Genus Leripurvs, Leach. 
LepipuRus viripuLus. (Fig. E, p. 88.) 
Lepidurus viridulus, Tate, Trans. & Proc. Philosoph. Soc. Ade- 
laide (1879), p. 136. 
* Animal, including flap of tail-segment, about an inch long, carapace 
rounded, elongate-oval, of a brownish-green colour, covering the whole 
abdomen excepting flap of tail-segment ; keeled toward the extremity, 
ending in an acute point, lunately notched posteriorly, and sharply 
and conspicuously hooked on its margin. Front and lateral margins 
of the carapace smooth and thickened. The rings of the abdominal 
segments, dark brown, are beset with stout spines equidistantly 
placed all round and directed backwards. The flap of the tail- 
segment has a blunt keel along its whole length, with blunt promi- 
nences, and its edges are ciliately serrated. The filaments of the tail 
are about half the length of the body, and are clothed with fine 
cilia. 
*« Hab. Collected by Thomas Tate, October 1878, in the floodwaters 
of the ‘ Reedbeds,’ near Adelaide. 
**Two Australian species of the genus have been described. LZ. vi- 
ridis, so called from its colour, inhabits Tasmania, and was diagnosed 
