1904.] EXTOMOSTRACA FROM SOUTH AFRICA. 299 



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, LiMXADiiD^. 



ESTHERIA ELIZABETHS G. O. SarS. 



Sars, Ai^ch. f. Math, og Naturv. xx. 1898. 



The collection included seA^eral 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. LiMNETiDS, 



LiMNETIS WAHLBERGI Loven. 



Loven, K. Y.-Akad. Handl. 1845, p. 203. 

 The specimens examined were all females. 



Cladocera. 

 Fam. Daphxids. 



MoiNA BELLI, sp. n. (Plate XYIII. 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 ; venti-al margin setose for 

 about two-thirds of its leng-th. Fii'st antennse ciliated all over. 

 Tail of the iisual shape, with eight lateral teeth, the fii'st of which 

 is bifvircated. 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 siu^face of tail provided with cilia, 

 which are more or less arranged in transverse i-ows. 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. loierzejskii Richard, and perhaps should 

 be regarded as only a variety of that species. It is mainly distin- 

 guishable by the ciliation of the head and first antennae, and by 

 the structure of the postabdomen. 



