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 subequal and a little shorter than peduncle, 
3 marginal pairs of spines and 5 unequal apical spines on both rami, 
inner ramus nonsetose. 
Second uropod, outer ramus shorter, both rami with 3 marginal 
and four apical spines, inner ramus nonsetose. 
Third uropod, only distal half of outer ramus extending beyond 
ends of uropods 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. 
Colour : Greyish, eyes black. 
Locality : Devils Peak, Newlands (Dr. W. F. Purcell); top of 
Table Mountain (sed ?) ; Platteklip Gorge, altitude 1000 feet (IX.H.B.) ; 
Karstenbosch, altitude 250 feet (K.H.B.); streams above Oranjezicht, 
Cape Town, altitude 400-500 feet (K.H.B.). (S.A.M. Nos. 1270, 
A2966, A3052, A3038, and A38059-62 respectively. ) 
A few males have the 2nd antennae stout compared with the Ist 
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 Nn. 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. 
Pieon 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 
