l895- No. 8. SOUTH-AFRICAN ENTOMOSTRACA. 7 



Of the inner organs, the alimentary tube is very conspicuous in the 

 lateral view of the animal (see figs. 2 & lo) by its yellowish green con- 

 tents. Its anterior part forms a very strong curvature within the upper, 

 gibbous part of the head. The cœcal appendages are rather elongated, 

 and curved in a sigmoid manner. 



The ova in the marsupial room or matrLx are, in individuals of the 

 earlier generations, very numerous and of a bluish green colour, with a 

 yellowish central oil-globule. 



The ephippium (see fig. lo) does not, as is generally the case, cause 

 any pronounced deformity of the upper part of the carapace. Seen later- 

 ally, it is of an oblong fusiform shape, and is drawn out anteriorly to a 

 narrow strip, which, like the whole upper margin of the ephippium, is 

 densely spinulose. The ampullae for the ova are, as in D. magna and 

 D. TJiomsoni, obliquely disposed. The colour of the epliippium is at 

 first rather pale, but becomes gradually darker, and, when detached from 

 the carapace, is of a ver}^ dark, nearly black hue. 



The recendy hatched young (fig. 6) exhibit an appearance rather 

 different from that in the adults, the head being very much produced at 

 the upper corner, assuming thereby an almost hood-shaped appearance. 

 They are, moreover, remarkable for the large size of the spine of the 

 carapace, which even equals in length the whole remaining part of the 

 body, and is slighüy arcuate. It has the appearance of being the imme- 

 diate continuation of the straight dorsal margin of the carapace, and is, 

 like the latter, coarsely spinulose. 



The adult male (fig. 7) is of very small size, as compared with the 

 female, measuring in length, without the spine, only 1,20 mm. The form 

 of the carapace is, as usual, narrower than in the female, oblong, with 

 the dorsal face far less vaulted, and the head also exhibits a rather dif- 

 ferent form, being comparatively shorter and more regularly rounded, 

 without any true rostral projection. The spine of the carapace is of 

 moderate length and considerably upturned. The free edges of the valves 

 form, as in other male Daphniae, anteriorly an angular corner, and are 

 here densely clothed with long and delicate cilia, also continued for some 

 distance along the ventral edges. 



The antennulae (see fig. 8) are much larger than in the female, and 

 freely movable. They do not, however, attain the length of the head, 

 and are rather narrow. The llagellum is very small, scarcely exceeding 

 74 of the length of the stem, and terminates in a fine point. Immediately 

 behind its base is seen the terminal fascicle of olfactory papillae, and at a 

 short distance from it anteriorly occurs a small sensory brisde. 



