Crustacean Fauna of South Africa. 207 



3rd in 4th and 5th peraeopods, 7th with 4-5 spine-setae on anterior 

 margin ; all 3 peraeopods spinose but scarcely at all setose. 



First uropod, rami siibequal and a little shorter than peduncle, 



3 marginal pairs of spines and 5 unequal apical spines on both ranii, 

 inner rarnus nonsetose. 



Second uropod, outer ramus shorter, both rami with 3 marginal 

 and four apical spines, inner ranius nonsetose. 



Third uropod, only distal half of outer ramus extending beyond 

 ends of uropod s 1 and 2, peduncle with 3 unequal spines at outer, 



4 at inner apical angle, outer ramus nearly three times length of 

 peduncle, outer margin with 4 groups of 3-4 spines, inner margin 

 with 2 groups, setae not numerous, 2nd joint small, tipped with 



1 spine and 2 setae, inner ramus ^ outer ramus, tipped with 2 spines 

 and 2 setae. 



Length : 10 mm. 



Colovr : Greyish, eyes black. 



Locality : Devil's Peak, Newlands (Dr. W. F. Purcell) ; top of 

 Table Mountain (sed '?) ; Platteklip Gorge, altitude 1000 feet (K.H.B.) ; 

 Kirstenbosch, altitude 250 feet (K.H.B.) ; streams above Oranjezicht, 

 Cape Town, altitude 400-500 feet (K.H.B.). (S.A.M. Nos. 1270, 

 A2966, A3032, A3038, and A3059-62 respectively.) 



A few males have the 2nd antennae stout compared with the 1st 

 antennae and a stronger and longer fringe of setae on the anterior 

 margins of the 3rd-5th peraeopods (in those respects somewhat 

 approaching G. capensis var. a). 



GAMMARUS CRASSICORNIS n. sp. 

 (Plate XXVII. Figs. 24, 25.) 



Head not quite equal to first 2 peraeon segments. Antero-lateral 

 lobes rounded truncate. Eyes very small, with whitish pigment, 

 glistening, invisible in spirit specimens. Side-plates 1-3 as deep as 

 their segments, all three rectangular and deeper than long, inferior 

 margin convex and setose, 4 similar to the preceding, without any 

 postero-lateral angle, posterior margin only very slightly emarginate. 

 Pleou segments 1-6 with a few setae on posterior margin, setae most 

 numerous on segments 4 and 5, no spines on 6th near insertion of 

 telson, postero-inferior angle of 3rd rounded quadrate. 



Telson scarcely more than half as long as basal width, cleft nearly 

 to base, lobes dehiscent, apices rounded-truncate, with 6 long setae, 



2 very fine setules on middle of lateral margin. 



First antenna reaching to 5th or 6th peraeon segment, 2nd joint 



