On some South-African Phyllopoda. 



The outer sexual appendages of the male (see fig. 2) 

 are comparatively short, extending but little beyond the 

 genital region, and they gradually taper towards the end. 

 They each have, somewhat beyond the middle, a slight notch, 

 but are otherwise quite smooth. 



The caudal rami (see fig. 12) are about 1 U as long as 

 the tail, and of the same appearance in the two sexes. They 

 are rather slender and slightly incurved, and they taper 

 gradually from the base to the tip. The marginal setas are 

 very strong and finely ciliated, forming a dense fringe, which, 

 on the outer edge, is quite uninterrupted, comprising- about 

 30 setæ gradually increasing in length to about the middle, 

 from thence rapidly diminishing in size. On the inner edge 

 there are about 16 similar setæ; but on its distal part these 

 setæ are replaced by short, unciliated spines. 



Of the inner organs, the intestine may be very distinctly 

 traced through the thin pellucid integuments (see figs. 1 and 2). 

 It extends as a cylindrical tube through the axis of the 

 body, and exhibits yellowish contents, which change towards 

 the posterior end to a dark brown. In the fore-part of the 

 head, this tube is joined by the short, ascending oesophagus, 

 and forms here on each side a rounded, densely lobular 

 cæcal expansion answering to the so-called liver in other 

 Phyllopoda. In the last caudal segment, it terminates in a 

 short, muscular rectum, which debouches on the obtusely 

 produced tip of that segment, between the insertion of the 

 caudal rami (see fig. 12). 



The heart is easy to detect in living specimens, on 

 account of its rapid pulsations. It extends through the 

 greater part of the body, just above the intestinal tube, 

 and in each segment exhibits a pair of valvular venous 

 fisures. 



