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Show 1 9 0 4 .] ENTOMOSTRACA FROM SOUTH AFRICA. 2 9 9 Total length 14 mm.; thorax 7 mm.; caudal rami 3 mm. The caudal rami of both sexes are stated by the collector to have been red during life. One of the male specimens is 25 mm. long-very much larger than Sars's two specimens, which measured 16 mm. only. Fam. L im n a d i id ^e . E sth er ia e l iz a b e t h /e G. 0. Sars. Sars, Arch. f. Math, og Naturv. xx. 1898. The collection included several specimens of this species, both male and female. While agreeing in all essential particulars with the description given by Sars, the females differed in having no cilia upon the base of their caudal claws. Fam. L im n e t id .e . L imnetis w a h l b e r g i Loven. Loven, K. V.-Akad. Handl. 1845, p. 203. The specimens examined were all females. C l a d o c e r a . Fam. D a p h n id .e . M o in a b e l l i , sp. n. (Plate XVIII. figs. 3, 4.) Dorsal margin of head evenly rounded, without any concavity above the eye ; ventral margin somewhat protuberant; posterior margin finely ciliated. Fornix well developed and extending over the eye. Shell without any trace of striation ; ventral margin setose for about two-thirds of its length. First antennae ciliated all over. Tail of the usual shape, with eight lateral teeth, the first of which is bifurcated. Between the bifurcated tooth and the first simple tooth is a minute elevation covered with cilia, which may represent a rudimentary tooth. Apical claws armed with a basal row of secondary denticles and with a ventral chitinous expansion cleft into teeth. Posterior dorsal surface of tail provided with cilia, which are more or less arranged in transverse rows. ' Ephippium reticulated all over and containing two resting eggs. Length 1*7 mm. Several specimens of this species were contained in the collection, but all were females, one of which was ephippial. The species very much resembles M. ivierzejskii Richard, and perhaps should be regarded as only a variety of that species. It is mainly distinguishable by the ciliation of the head and first antennae, and by the structure of the postabdomen. |