Crustacean Fauna of South Africa. 209 



Eavine, 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.) 

 cJ <J , ovigerous ? ? and young. (S.A.M. Nos. A3031, A3034, and 

 A3864.) 



GAMMARUS AURICUI/ARIUS, n. 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 tlieir segments, inferior 

 margins convex, setose, 4 similar to and not much wider than 3, no 

 postero-lateral angle, hind margin very slightly emarginate. Pleon 

 segments 4 and 5 and to a lesser extent also 3 setose on hind margins, 

 postero-inferior angle of 3 rounded-quadrate, inferior margins of 1-3 

 sparsely setose. 



Telson f as long as basal width, lobes dehiscent, apices rounded, 

 setose. 



First antenna reaching to 5th peraeou segment, peduncle reaching 

 just beyond apex of penultimate peduncular joint of 2nd antenna, 

 2nd joint 1st, 3rd % 2nd, flagellum longer than peduncle, ca. 25- 

 jointed in <$ , 20 in $ , accessory flagellum 3-jointed. 



Second antenna reaching to middle of flagellum of 1st antenna, 

 gland-cone not prominent, with subapical papilla, 3rd and 4th joints 

 stout, 3rd 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-jointed ; in 

 ? 3rd joint normal, 3rd and 4th normal in width, flagellum 8- 

 joiuted. 



Mandibles, cutting-edge 4-dentate, accessory cutting-edge 4-deutate 

 in left, bideutate in right, palp slender, 3rd joint not equal to 2nd. 



First and second guathopods, 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 guathopod 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. 



