1 895- ^O- 8- SOUTH-AFRICAN ENTOMOSTRACA. 2$ 



projects beyond the edges of the valves. The tail agrees in shape with 

 that of the female, except that its anterior edge is provided, at some 

 distance from the tip, with a slight notch, indicating the place where the 

 efierent ducts of the testes debouch. 



The colour is a more or less dark yellowish brown, being, as usual, 

 paler in the male than in the female. As above stated, in females car- 

 rying winter-eggs, the upper part of the carapace sometimes assumes a 

 very dark, almost blackish hue. 



Observations. This interesting form was only raised in one of my 

 aquaria, but multiplietl rather plentifully in this during the course of the 

 summer. It did not however reappear the succeeding seasons.- 



In habits it agrees with most other Lynceids, being generali}^ found 

 within the loose deposit at the bottom, at times, howcA^er, especially during 

 sunshine, ascending the walls of the aquarium. Its movements, when 

 swimming, are rather slow, and cause a quite even run through the water, 

 the bod}' being, as a rule, kept in a horizontal attitude, with the back 

 downwards. Male specimens were very scarce. 



Gen.: Chydorus, Baird. 



9. Chydorus Barroîsï, (Richard). 



(PI. 4, figs. 9— 13.) 



Pleuroxus Baroisi, Richard, «Cladocères, receuillis par Mr. Barrois en Svrie 



et en Egypte» (Revue Biol. i\\\ Xord de la France, Tome M), 



p. 16. 

 Specific Characters. Body very tumid, subglobose, resembling in 

 shape that of Ch. spJLœricus. Carapace of female, seen laterally, about 

 as broad as it is long, posterior extremity narrowly truncated, dorsal 

 margin boldly curved, ventral obtusely produced in the middle and nearly 

 straight behind. Head procumbent, mobile, terminating in an acute rostrum. 

 Carapace of male less broad than in female, dorsal face gibbous in front 

 of the middle, inferior edges slightly sinuated behind the median expan- 

 sion. Surface of valves sculptured in their anterior part with very con- 

 spicuous curved transverse striae, posterior part distinctly reticulated, infero- 

 posteal corners armed with a distinct denticle. Ocellus smaller than the 

 eye, and located about half way between the latter and the tip of the 

 rostrum. Inferior expansion of the labrum haAing the edge divided into 

 4 very conspicuous serrations. Tail in female with the postanal angle 

 acutely produced, outer part of uniform breadth and slightly incised at the 

 tip, anteanal denticles about 12 on each side, terminal claws moderately 



