Contributions to the Crustacean Fauna of South Africa. 407 



anterior margin nearly straight, with a slight median point, side 

 margins straight or very slightly emarginate in $ , with the antero- 

 lateral angles rounded but prominent, in 9 en tly convex without 

 prominent autero- lateral angles. 



Peraeon segments 1-4 short but gradually increasing in length, 

 antero- and postero-lateral angles of the side plates rounded-quadrate ; 

 segment 5 equal to 4 in length, segments 6 and 7 decreasing in length, 

 antero-lateral angles of side-plates on 5 rounded-quadrate, on 6 and 7 

 rounded, postero-lateral angles on all three segments acute. 



Pleon a little narrower at base than peraeon segment 7, about as 

 long as broad in $ , a little shorter in $ , narrowing very slightly pos- 

 teriorly ; side margins concave and sinuous in <$ , slightly convex in ? , 

 apex rounded, postero-lateral angles strongly acute and produced in 

 , c , nearly equal to ^ length of telson, in ? acutely produced but very 

 little beyond the rounded apex. Upper surface in both sexes with 2 

 minute submedian tubercles in the middle. 



The ventral surface of peraeon segments 1-4 in $ is moderately 

 convex, of segments 5-7 and of the pleou strongly vaulted ; in the ? 

 the pleon is vaulted but all the peraeon segments are concave so as to 

 accommodate the developing embryos. 



Antenna 1, 1st joint stout, ovate, 2nd as long as 1st but very 

 slender, more so in than $ , 3rd | in ^ , in ? i length of 2nd and 

 equally slender, flagellum slender, nearly as long as peduncle, composed 

 of 5 nearly equal joints in $ , in ? of 1 stout and 2 long joints, the 

 apical joint setose. 



Antenna 2, peduncle stout, longer and stouter in <$ than ? , 3rd 

 joint longer than 1st plus 2nd, with a stout spiuiform upstanding 

 dorsal projection at base, 4th short, 5th longer than 4th but shorter than 

 3rd, 6th equal to 3rd and ending in a narrow subacute point, the 

 suture between 5th and 6th clear but the joints not freely moveable on 

 one another, flagellum inserted before the apex of 6th, extremely slender, 

 not quite as long as 5th plus 6th peduncular joints, composed of 8 

 setiferous joints. 



Mouth-parts as figured by Sars for H. licaspis (Norweg. 1ST. Atlaiit. 

 Exp. 14, p. 122, pi. 10, 1885), only the mandibular palp a little more 

 slender. 



Epistome prominent, triangular, the projecting anterior subacute 

 apex visible from above. 



Peraeopods as in -H". ~bicuspis, similar to one another, but becoming 

 longer and more slender posteriorly. 



Three pairs of marsupial plates attached to segments 2-4, large, 

 without marginal setae. 



