On Fresh-water Entomostraca. 69 



marginal setæ, and also at the inner corner above, a 

 simple bristle. 



The eye is rather small, though distinct, being placed, 

 as usual, at some distance from the front and nearer the 

 ventral than the dorsal face. 



The anterior antennæ (see fig. 1) are comparatively 

 shorter than in the New Zealand species, scarcely exceeding 

 in length the anterior division of the body, and they are 

 divided into the usual number (25) of articulations. 



The posterior antennæ, the oral parts and the 4 ante- 

 rior pairs of legs in their structure agree, on the whole, per- 

 fectly with those parts in B. triarticulata, and need not 

 therefore be described in detail. 



The last pair of legs (fig. 2) are also constructed in a 

 very similar manner, being, like the preceding pairs, natatory, 

 though differing from them in some points. The outer 

 ramus is rather robust and, as in the other known species, 

 has the 2nd joint produced inside to a strong conical pro- 

 cess, coarsely denticulated on both edges. The terminal 

 joint of this ramus is comparatively smaller than in B. tri- 

 articulata, being scarcely as long as the preceding joint, and 

 very much narrower. It is, however, armed with the same 

 number of spines, viz., 7, 2 of which issue from the outer 

 edge, 3 from the inner, and 2 from the tip; of the last 

 the outer one is much the larger and considerably stronger 

 than any of the others. The inner ramus is but little more 

 than half as long as the outer, and much narrower. Of its 

 3 joints, the terminal one is comparatively much smaller 

 than in B. triarticulata, and carries only 5 setæ, whereas 6 

 such setæ are found in the said species. On the other 

 hand, the 2nd joint has an additional seta inside, not found 

 in B. triarticulata. 



