1886.] ENTOMOSTRACA FROM SOUTH AUSTRALIA. 87 



hard and dense, dark brown (one of the specimens has a broad 

 white marginal band). Length j\ of an inch ; height y\. 



Hab. Lake Bonney, River Murray, South Australia ; also Fowler 

 Bay, Great Australian Bight (Prof. R. Tate). 



Genus Eulimnadia, 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 ^^\ of 

 an inch ; height j^^^y, width jLO_. 



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 Eulimnadia I found on 

 dissection a large colony of a protozoon, possibly Areella dentata, 

 Ehrenberg, at any rate very closely resembling that species, as 

 figured by Professor Leidy. 



Family A p o d i d ^, Burmeisfer. 

 Genus Lepidurus, Leach. 



Lepidurus viridulus. (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. Innately 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- 

 uences, 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 1 878, in the floodwaters 

 of the ' Reedbeds,' near Adelaide. 



" Two Australian species of the genus have been described. L. vi- 

 ridis, so called from its colour, inhabits Tasmania, and was diagnosed 



