Contributions to the Crustacean Fauna of South Africa. 337a 



ExANTHURA MACRURA, H. Sp. 



(Plate XXVIII. A.) 



Body narrow, smooth, glabrous. Head a little longer than broad, 

 with small median projection, eyes oval, prominent. Peraeon 

 segments flat dorsally, with a pit in the middle (not on the anterior 

 margin) of segments 4-6, ventrally keeled, 1st segment a little longer 

 than head, segments 2 and 3 subequal, a little longer than 1st, 

 segments 4 and 5 subequal, segments 6 and 7 shorter, posterior 

 segments wider than the anterior ones. 



Pleon segments 1-5 as long as 6th peraeon segment, but broader 

 than any of the peraeon segments, fused but the sutures distinct. 

 Telson very long (5 mm. or nearly one-quarter the total length 

 of the animal), equal to peraeon segments 5-7 together, rather 

 spatulate, broader distally than basally, distal margin truncate, 

 postero-lateral angles obtuse, with short plumose setae. 



First antenna, 1st joint largest, with a large triangular recurved 

 process on outer margin, 2nd and 3rd together equal to 1st, flagellum 

 as long as peduncle, 9-jointed, 1st joint short. 



Second antenna, 2nd joint largest, twisted and hollowed for the 

 reception of 1st antenna, 3rd and 4th subequal, 5th nearly equal 

 to 3rd and 4th together, flagellum a little longer than 5th peduncular 

 joint, 6-jointed, 3rd-5th joints of peduncle and whole of flagellum 

 sparsely setose. 



Upper lip triangular, distal margin cleft. 



Lower lip, lobes with a small point on inner apical angle. 



Mandibles, cutting edge entire, cutting-plate with a feebly convex 

 margin, not toothed but with a series of blunt tubercles, molar nearly 

 obsolete, palp with 2nd joint half as long as 1st, 3rd subequal to 1st, 

 setose. 



First maxilla 6-toothed. 



Second maxilla small, narrow, apex with 2 setules. 



Maxilliped 4 jointed, 1st joint distinct, 2nd and 3rd stout, sub- 

 equal, 4th rounded, apex with a few setules, epipod oval, a little more 

 than half length of 2nd joint. 



First peraeopod, inner apex of 2nd joint produced into an 

 obtuse projection, 6th elongate and much produced backwards, 

 palm short, with scattered setae, the basal half forming a rounded 

 lobe, 7th joint reaching to middle of lobe on palm, unguis to middle 

 of 5th joint, which is apically setose. 



Second and third peraeopods, 2nd and 3rd joints subequal, 5th 

 underriding 6th, which is parallel-sided with a short, stout spine on 

 inner apex. 



