Crustacean Fauna of South Africa. 209 
Ravine, and Platteklip Gorge ; in small streams or moss damped by 
trickling water (perennial). 25/4/14, 21/6/14, and 1/8/15. (K.H.B.) 
od, ovigerous 2 2 and young. (S.A.M. Nos. A8031, A3034, and 
A35864.) 
GAMMARUS AURICULARIUS, Nl. Sp. 
(Plate XXVII. Figs. 26-28.) 
Head not equal to first 2 peraeon segments. Antero-lateral lobes 
rounded truncate. Eyes small, circular, glistening white, invisible in 
spirit specimens. Side-plates 1-4 as deep as their segments, inferior 
margins convex, setose, 4 similar to and not much wider than 3, no 
postero-lateral angle, hind margin very slightly emarginate. Pleon 
seoments 4 and 5 and to a lesser extent also 3 setose on hind margins, 
postero-inferior angle of 38 rounded-quadrate, inferior margins of 1-3 
sparsely setose. 
Telson 2 as long as basal width, lobes dehiscent, apices rounded, 
setose. 
First antenna reaching to 5th peraeon segment, peduncle reaching 
just beyond apex of penultimate peduncular joint of 2nd antenna, 
2nd joint ? Ist, 3rd 4 2nd, flagellum longer than peduncle, ca. 25- 
jointed in ¢, 20 in 9, accessory flagellum 3-jointed. 
Second antenna reaching to middle of flagellum of Ist antenna, 
gland-cone not prominent, with subapical papilla, 3rd and 4th joints 
stout, 8rd in fully adult ¢ with a large oval ear-like lobe on outer 
apex, extending to middle of 4th, 4th and 5th subequal but 5th more 
slender, flagellum equal to 3rd—5th joints together, ca. 14-joited ; in 
2 3rd joint normal, 3rd and 4th normal in width, flagellum 8- 
jointed. 
Mandibles, cutting-edge 4-dentate, accessory cutting-edge 4-dentate 
in left, bidentate in right, palp slender, 3rd joint not equal to 2nd. 
First and second egnathopods, 2nd joint of nearly equal width 
throughout, 6th longer than 5th, oblong, scarcely wider distally, palm 
transverse, convex, defining angle blunt, with 3 spines, finger matching 
palm ; 2nd gnathopod the larger; in ? similar but smaller. 
First peraeopod in adult ¢ shorter than 2nd, 4th joint slightly 
expanded on hind margin, wider distally than proximally, 5th with a 
subacute lobe at base of hind margin, bearing 1 spine, margin thence 
to apex sinuous with a central rounded prominence, setose, 6th longer 
than 4th, slightly curved, hind margin setose but not spinose, 7th 
with 1 spine-seta near apex of hind margin; in ? normal as in 2nd 
peraeopod., 
