On some South- African Phyllopoda. 19 



The head is not very large, and exhibits somewhat 

 behind the middle a distinct transverse suture joining the 

 upper ends of the mandibles. By this suture the hind part, 

 or cervical segment, is pretty well defined from the anterior 

 part, and it expands on each side to a rounded lobe, within 

 which the shell-gland is visible. The frontal part of the 

 head in the female is evenly rounded, whereas in the male 

 it projects to a short conical prominence slightly notched 

 at the tip (see fig. 4). 



The trunk, or mesosome, is composed of 11 well-defined 

 segments of uniform size and simple cylindric form, each 

 carrying a pair of branchial legs. 



The genital region is rather short, scarcely longer than 

 the succeeding- caudal segment, and is composed of 2 seg- 

 ments, which are partly coalesced, though distinctly defined 

 dorsally. From the ventral side of this region in the female 

 (fig. 1) the slender marsupial pouch issues, extending, when 

 fully developed, beyond the 4th caudal segment. In the 

 male (fig. 2) this pouch is replaced by 2 comparatively 

 small, juxtaposed appendages containing the outer part of 

 the vasa deferentia. 



The tail proper is very slender, cylindric, and, not 

 including the caudal rami, exceeds the whole trunk in length. 

 Of its 7 segments, the 6 anterior are of about equal size 

 and are considerably longer than they are broad, whereas the 

 last segment is rather short and obtusely produced between 

 the insertion of the caudal rami (see fig. 12). In the male 

 (fig. 2) the posterior segments are clothed on the upper face 

 with numerous small tubercles, each carrying a delicate 

 sensory hair. 



The compound eyes (see figs. 1, 2, 4), as in other 

 Brauchipodids, are pedunculated and freely mobile, extend- 



