214 Annals of the South African Museum. 



Side-plates distinct on all segments (except first?). 



Pleon of 4 fused segments. 



Second antennae with 3- jointed flagellum. 



NEOAECTURUS OUDOPS, n. sp. 

 (Plates XVIII. C and XIX. B.) 



Body granular, without bend between 4th and 5th peraeon seg- 

 ments ; head longer than broad, anterior margin excavate, antero- 

 lateral angles blunt, no cheeks, a transverse groove dividing two low 

 rounded and granular dorsal ridges, no eyes. 



Peraeon, all the segments about equal in length, the anterior ones 

 being a little longer than the posterior ones, antero-lateral angles of 

 the 1st segment not much produced, the first four segments with 

 two transverse angular dorsal ridges, the anterior of which is smaller 

 than the posterior, the three last segments with one large transverse 

 ridge. 



Side-plates distinct on all the segments (including the first ?). 

 Pleon of four fused segments, the dividing grooves being distinct, 

 first segment small and short, second large and swollen, the fourth 

 (telson) with lateral subapical wings. 



First antenna, 1st joint stout, 3rd joint short and geniculate, 

 flagellum a little longer than 2nd joint, with 6 pairs of sensory 

 filaments and 2 apical setae. 



Second antenna, 1st and 2nd joints short, 3rd 4th and 5th 

 becoming gradually more slender, 4th a little longer than 3rd and 

 5th a little longer than 4th, flagellum as long as 5th joint, 3-jointed, 

 the 2nd joint being the longest. 



Upper lip shallow, semicircular, very minutely hirsute. 



Lower lip, lobes broad, inner angles excised. 



Mandibles, the left strongly angular, cutting-edge tridentate, 

 secondary cutting-edge bidentate, spine-row with 3 spines, molar 

 prominent, quadrate ; the right straight, both cutting-edges entire 

 and rather feeble, spine-row with one feeble spine, molar strong, 

 oblique, with setae on posterior surface. 



First maxilla, outer plate with 9-10 spines, inner plate with 

 2 spines and some setules. 



Second maxilla, outer and middle plates with 3 spines, inner with 

 numerous spines. 



Maxillipeds, 1st joint strong, 3rd joint short, 7th joint short and 

 blunt, 5th 6th and 7th joints with pectinate setae, inner plate with 

 rather sharp inner angle, setose but without coupling-hooks, epipod 



