54 Annals of the South African Museum. 



As in the head so in the peraeon, the middle of the back is compara- 

 tively smooth, but other parts are armed with a multitude of very 

 unequal spines, the largest occupying prominences on the flanks of 

 the first four segments. In the first three there are also small sub- 

 divided spines nearer the middle, and the fourth has a notable pair 

 of backward curving spines near its hind margin. The remaining 

 segments of the peraeon and the whole pleon are pretty well covered 

 with little spines, some of which are much smaller than others. The 

 pleon has two decided, but apparently quite unsutured, transverse 

 dorsal furrows in advance of the telsonic segment. The latter carries 

 no very strong spines, and slopes rather abruptly down to a smoothly 

 rounded apex. The dividing line between the head and first peraeon 

 segment is well marked. 



As noted by Beddard for other species, the side-plates of the 

 fourth peraeon segment here evidently help to support the ovigerous 

 lamellae. They here form a narrow strip directed obliquely backward, 

 with a dentate process directed forward from the fore margin. In 

 advance of these the segment displays a pair of little rounded wings. 



The first antennae have a spine-like tooth on the short broad first 

 joint ; the two following joints are much narrower than the first but 

 not much shorter, together scarcely as long as the one-jointed 

 flagellum, which has a couple of filaments at four or five points of 

 the margin, and an apical group of four. 



The second antennae have a tooth process on the short first joint, 

 a close set group of six such processes on the longer second, and 

 seven or eight more sparsely arranged on the much longer third 

 joint ; the fifth joint is a little shorter than the fourth, both being 

 very long and slender, with a few setules ; the flagellum is five- 

 jointed, about three-fifths as long as the last joint of the peduncle 

 and longer than its first three joints combined. On one of these 

 appendages there is a little apical tooth, which may represent a sixth 

 joint. 



The upper lip is somewhat unsymmetrical, with a decided emargi- 

 nation. The mandibles are robust, with the cutting plate quadri- 

 dentate, the accessory plate at least in one mandible tridentate, the 

 spine-row consisting of few spines, the molar powerful. The first 

 maxillae have three plumose setae on the inner plate, and eleven 

 spines on the outer plate of one maxilla, while on that of its partner 

 there seemed to be only ten. The low y er lip and second maxillae 

 are of the usual character. The maxillipeds have the second joint 

 surmounted by a broad plate which seems to form two leaves ; to 

 what extent these are separated remains doubtful ; on neither could 



