260 Annah of the. South African Museum. 



Jnd gnathopods in ? orange-brown, eyes faint, of the same colour as 

 body. 



Locality : Sea Point, near Cape Town. 15 and 29/11/13. (K.H.B.) 

 c(J,?? (with ova and embryos) and immature specimens. (S.A.M. 

 No. A2894.) 



MACKOPISTHOPOUS n. g. 



Side plate 1-5 well developed, 5 as deep as 4, with small hind-lobe. 

 First antenna without accessory flagellum. Outer lobe of lower lip 

 deeply notched, the outer portion smaller than the inner. Molar well 

 developed, palp of mandible with 3rd joint shorter than 2nd. First 

 and second gnathopods similar in, both sexes, 6th joint not enlarged, 

 very feebly chelate. Sixth joint of peraeopods 3-5 not strongly 

 expanded apically. Fifth peraeopod enormously enlarged, flattened, 

 oar-like. Kami of 3rd uropod short, outer with 2 hooks. Telson 

 with the lateral angles nearly apical. 



MACKOPISTHOPOUS STEBBINGI n. sp. 

 (Plate XXVIII. Figs. 15-17.) 



Body fairly compressed, back rounded, smooth, lateral lobes of head 

 not prominent, eye round. Side-plates 1-5 'ovoid, rounded below, 

 increasing in length and slightly in depth, a short row of long setae 

 on postero-inferior angle, 6 shallow, bilobed, 7 shallow, semicircular. 



Pleon-segmeuts 1-8 with postero-inferior angles rounded. 



Telsou triangular, broader than long, apex shortly truncate with a 

 small tubercle at each angle and 2 large and 2 small setae between 

 them, 1 large and 1 small seta in the middle of lateral margin. 



First antenna reaching to end of 4th peraeon segment, 1st joint 

 stouter and a little longer than 2nd, 3rd half 2nd, all 3 joints apically 

 setose, 1st and 2nd in $ with a fairly dense fringe of long plumose 

 setae on lower margin, flagellum longer than peduncle, ca. 2 5- jointed 

 in J 1 , ca. 20 in $ , in both sexes with narrow sensory filaments. 



Second antenna half as long as 1st, ultimate joint slightly longer 

 than penultimate, joints stouter in <$ than in ?, penultimate and 

 antepenultimate joints in J with dense fringe of long plumose setae 

 on lower margin, flagellum equal to or a little shorter than peduncle, 

 13- jointed. 



Upper lip broader than long, entire, distal margin setose. 



Lower lip, outer lobes deeply notched, the outer portion being 

 scarcely half the size of inner, mandibular processes curved, stout, 

 apically subacute, inner lobes broad. 



