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Show 1886.] ENTOMOSTRACA FROM SOUTH AUSTRALIA. 87 hard and dense, dark brown (one of the specimens has a broad white marginal band). Length T\ of an inch ; height T 3g. Hab. Lake Bonney, River Murray, South Australia; also Fowler Bay, Great Australian Bight (Prof R. Tate). Genus EULIMNADIA, Packard. (Limnadia, Brongniart, in part.) E U L I M N A D I A 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 y3^ of an inch ; height j^-, width A^. 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 Arcella dentata, Ehrenberg, at any rate very closely resembling that species, as figured by Professor Leidy. Family APODIDI, Burmeister. Genus L E P I D U R U S , Leach. L E P I D U R U S V I R I D U L U S . (Fig. E, p. 88.) Lepidurus viridulus, Tate, Trans. & Proc. Philosoph. Soc. Adelaide (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 prominences, 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. L. vi-ridis, so called from its colour, inhabits Tasmania, and was diagnosed |
