432 Annals of the South African Museum. 



joint stout in peraeopods 2 and 3, longer in peraeopod 4, 4th-Gth 

 joints subequal in peraeopod 2, in peraeopods 3 and 4 4th joint a 

 little longer than 5th and 6th, inner margins of 3rd-6th joints with 

 fringe of long setae, 7th joint minute, ending in a curved unguis. 



Peraeopods 5 to 7 subequal in length and similar to one another, 

 stout, 2nd joint longest, twice as long as wide, outer margin with 

 blunt tubereles (obscure on peraeopod 5), 5th joint shortest except 

 7th, which is triangular and ends in a short but strong curved unguis, 

 with a strongly chitinized " pad " on inner margin before the unguis. 



Male appendage on 7th peraeon segment single, tapering gradually 

 to a subacute apex. 



Marsupial plates 3 pairs, on segments 2-4, that on 4th segment has 

 no inset piece, but posterior margin is setose, inferior margin simple. 



First pleopod with oblique row of 3 ( $ ) or 4 ( ? ) hooked setae on 

 middle of peduncle, rami as long as peduncle, outer ramus in $ with 

 long setae in middle. 



Second pleopod with 3 hooked setae near inner apex of peduncle, 

 rami longer than peduncle, male stylet a little longer than ramus, 

 distal end enlarged, curved outwards and ending in a finely pointed 

 apex. 



Third to fifth pleopods with rami lanceolate, covering ramus 

 shorter than the other, with a long plumose setae near apex on 

 outer margin. 



Uropods narrow, proximal end rounded, tapering gradually distally, 

 exposed ramus small, triangular, longer than broad, outer margin 

 slightly concave, margins finely setose, concealed ramus very small 

 with 3 terminal setae and 1 subterminai on outer margin. 



Length: $ 5mm., 2 10mm.; brcmlth : $ 1mm., ? 2mm. 



Colour : Uniform claret-colour, 5th joint and flagellum of 2nd 

 antennae with lighter bands, eyes black. 



Locality : Atlantic coast of the Cape Peninsula near the Cape of 

 Good Hope and near Cape Town. 29/9/13 and 15/11/13. (K.H.B.) 

 2 $ $ , several $ $, some ovigerous, and young from 3 mm. 

 upwards. On red seaweed at low-tide. (S.A.M. Nos. A2527 and 

 A2600.) 



-In immature specimens peraeon segments 4-7 are subequal, and 

 specimens under 4 mm. in length lack the peraeopods on 7th peraeon 

 segment. 



The specific name is in allusion to the flattened shape of the 

 animal, in consequence of which it is exceedingly difficult to see; it 

 is the exact colour of the weed, lies along the smaller branches and 

 clings very tenaciously. 



