1895- Xo. 8. SOUTH-AFRICAN ENTOMOSTRACA. 49 



This is also the case witli the maxillae (fig. 4) and the anterior maxil- 

 lipeds (fig. 5), which therefore need not to be described in detail. 



The posterior maxillipeds (fig, 6), on die other hand, differ very 

 markedly fi^om those in the genus Diaptomtis^ their terminal part being 

 much more strongly built, and only composed of 3 joints, whereas this 

 part in the said genus is constantly 5-articulate. Moreover, the bristles 

 issuing fi-om this part are fewer in number, and partly transformed to 

 claw-like spines, one of which, issuing from the tip, is particulars strong 

 and dentiadated inside. 



The 4 anterior pairs of legs figs. 7—9} agree, on the whole, in their 

 structure with those in the genus Diaptomus, though they are perhaps, some- 

 what shorter and stouter. As in tliat genus, the ist pair (fig. 7) are the 

 smallest, and have the inner ramus only composed of 2 joints, whereas 

 in the 3 succeeding pairs tliis ramus is, like the outer one, 3-articulate. 

 As to tlie nimiber of spines and natatory setae issuing from tliese legs, 

 it likewise agrees witli that found in the genus Diaptomus, except, that 

 on the ist pair (fig. 7}, there is an additional spine outside the terminal 

 joint of tlie outer ramus. The outmost spine in all the legs is much the 

 largest, though scarcely as elongated as in the species of the genus 

 Diaptomus. 



The last pair of legs (PI. 7, fig. 4) are very unlike the preceding 

 ones, and not natatory. In structure they somewhat resemble those in the 

 genus Diaptamiis, though exhibiting some points of divergence. Thev 

 consist, as the preceding pairs, each of a biarticulate basal part and 2 

 rami, wliich latter, however, are peculiarly modified. The outer ramus is 

 much the larger, and composed of 3 articulations, the ist of which is the 

 largest, and without any spine or seta. The 2nd joint carries, outside, a 

 spine, and is produced at the end, inside, to a strong claw-like process, 

 denticulated on the inner edge. The 3rd joint is well defined, and, like- 

 wise, claw-like, extending almost to the tip of the above named process, 

 and having, inside, a slender spine. The inner ramus, which extends nearly 

 to the tip of the ist joint of the outer, is narrow cylindric, and is com- 

 posed of 2 well defined joints, the outer of which has 2 unequal, slender, 

 apical spines. 



The egg-bag, which is carried beneath the tail, attached to tlie geni- 

 tal protuberance of the ist segment (see fig. 2], is rather large, flattened, 

 and almost circular in outline. It contains numerous eggs generally arranged 

 in 2 layers, and of a dark brown colour. 



Of inner organs, several may be more or less distinctly traced in 

 the living animal through the semi-pellucid integuments (see PI. 7, figs, i 



Vid.-SeLäk. Skriiter. M.-N. KL 1S95. No. S- 4 



