NEW AMPEIPOD FROM THE TKAXSVAAL, 111 



margin ; two small spines on posterior margin distally. The 

 fourth joint short, the shape of a rhombus, with setose cushion 

 on posterior margin and two stout bristles just behind the 

 cushion. The fifth joint longer than the third or sixth, broadest 

 at its distal base, and expanded also about the middle ; a setose 

 cushion extending along nearly the whole of the free posterior 

 margin ; a thickened chitinous enlargement on the distal part of 

 the cushion; four bristles just behind the cushion placed subequi- 

 distant apart. The sixth joint nearly as long as the fifth ; the 

 posterior margin also with minvite setse. Behind the setose part 

 a number of stout bristles. 



Pereiopod I. — ISTot quite as long as pereiopod II, the coxal plate 

 like that of gnathopod II, excavate behind with conical process. 

 The second joint linear ; the third joint shortest and convex 

 behind ; the fourth joint linear, broadest distally ; the fifth and 

 sixth joints linear. The sixth joint longer and much narrower 

 than the fifth ; the last joint small, with claw. 



All the joints with spines which are most numerous on the 

 anterior margin of the appendage. 



The costegites are rather small lanceolate structures which are 

 twisted and bent inwards ; each carries about ten setae. 



Pereiojjod III(P\. XI. fig. 8). — Coxal plate unlike the preceding, 

 bilobed, with a few spines. The second joint swollen, posterior 

 margin convex ; the third joint short ; the fourth and fifth 

 joints subequal. The fourth joint broadest at its distal extremity 

 and broader than the fifth. The sixth joint linear, narrow, and 

 longer than the fifth. Spines most numerous on the anterior 

 margin of appeiidage. 



Pereiopod IV (PI. XI. fig. 9) : together with pereiopod V con- 

 siderably longer than the other pereiopods. In general pro- 

 portion like pereiopod III. The coxal plate is small. The second 

 joint is expanded. 



Pereiopod F(P1. XI. fig. 10). — Ooxal plate small and shallow; 

 the second joint -mTich expanded, the posterior border notched 

 behind each small spine. Third joint very short. Fourth, fifth, 

 and sixth joints linear. ^Numerous spines, especially on anterior 

 margin of appendage. 



The Pleopods (PI. XI. figs. 11 k 12).— The first the longest; 

 the third by far the shortest ; the second is intermediate in 

 size. 



The Uropods (PI. XL figs. 13 k 14).— The first the longest; 

 the second a good deal shorter, and the third minute. 



The first and second uropods are armed with stout bristles ; on 

 the distal joints these bristles are curved at their distal ends. 

 The distal end of the third uropod is armed with one stout and 

 one very small bristle ; it consists of two joints. The basal joint 

 with one large arid one smaller bristle. 



The TeUon (PL XI. fig. 15).— Simple, slightly divided at base. 

 It bears two bristles on each side. 



