208 Annals of the South African Museum. 



2 rather larger ones just behind these, anterior margin semicircularly 

 excavate, antero-lateral angles subtruncate, eyes prominent, sub- 

 triangular, dark. 



Peraeon segments 1-3 subequal in length, smooth in $ , in $ with 

 1 median setiferous tubercle. The first segment has the antero- 

 lateral angles produced almost to the vertical from the hind margin 

 of the eyes, where it meets a downward projection of the head 

 (cheek). 



Fourth peraeon segment in $ 6 times as long as 3rd, cylindrical, 

 smooth with low inconspicuous median tubercle on posterior margin, 

 in $ not quite 6 times as long as 3rd, broadest in front where the 

 lateral margins are expanded to form a tubercle, posteriorly the 

 margin forms an expanded denticulated wing, dorsurn with 2 large 

 setiferous bosses in front, behind these a blunt median spine and on 

 the posterior margin 2 longer blunt spines. These spines are usually 

 very feebly setose, especially the median one, but in the single 

 specimen from False Bay all three bear strong tufts of setae. 



Peraeon segments 5-7 larger than the first three, the 5th rather 

 larger than 6th or 7th, smooth in $ with low median tubercles, in 

 S? with stronger setiferous tubercles. 



Side-plates not marked on first segment, on the 2nd and 3rd small 

 in $ but large and tubercular in ? , on the 4th small and indistinct 

 in both sexes, on 5th 6th and 7th large and tubercular in both 

 sexes. 



The above applies to the ovigerous $ . The young $ has less 

 prominent non-setose dorsal tubercles. 



Pleon composed of 3 short basal segments and the long telson, all 

 completely fused, the junctions being marked by furrows only, 

 smooth and glabrous in both sexes. 



First antenna, reaching almost to the middle of 3rd joint of second 

 antenna, 1st joint broad, bluntly produced on inner margin, 2nd and 

 3rd joints subequal, rlagellum as long as peduncle, broadest a little 

 way from base, then tapering to a blunt apex, with apical tuft of 

 setules, and long marginal sensory filaments ca. 15 in $ , ca. 10 

 in J . 



Second antenna, 1st and 2nd joints short, 3rd joint equal to 1st 

 and 2nd together, 5th joint equal to 2nd and 3rd together, 4th joint 

 a little longer, inner and lower surfaces of 3rd and, to a less extent, 

 4th joints with short blunt tubercles in $ , smooth in ? , flagellum 

 half length of 5th peduncular joint, its 1st joint long, 2nd joint one- 

 quarter length of 1st, 3rd joint one-third length of 2nd, junction 

 between 2nd and 3rd obscure, 3rd joint bearing a strong apical 



