The Sympoda. 169 



line, the denticle perhaps not constantly present. The pedigerous seg- 

 ments narrow successively towards the pleon. The pleon segments 

 are laterally, as so commonly in male Sympoda, bicarinate for the 

 protection of the slender flagellum of the second antenna ; the fifth 

 segment is distally narrowed, not very elongate, though much longer 

 than any of the other segments, telsonic segment not longer than 

 broad. 



First antenna with first joint geniculate, larger than second, 

 second than third, flagellum slight, three-jointed, accessory minute, 

 one-jointed. Second antenna with penultimate joint of peduncle 

 more than half as long as the last joint, furnished with strong brush 

 of setae; first joint of the long slender flagellum knobbed at the base. 



Upper lip not quite symmetrically bilobed. Lower lip with 

 inward pointing apical tooth to each lobe. Mandibles with cutting 

 plate and accessory finely dentate, spine-row of six spines, molar 

 slender, with its narrow apex divided into about six close-set teeth, 

 of which the hindmost is the strongest. First maxilla with only 

 :seven spines on apical margin of outer plate, palp with two very 

 unequal apical filaments. Second maxilla with eleven seta-like 

 spines distributed on its divisions. 



First maxillipeds having the large laminar antepenultimate joint 

 bordered by six spitulate spines with an ordinary spine at the apex 

 .and followed by two short joints, of which the second is much the 

 narrower and tipped with a slender spine. The proximal joints are 

 not easy to distinguish, but between that which carries the two little 

 coupling spines (the true second joint) and the laminar fourth joint 

 there is an indication of an intervening third joint. The branchial 

 elements of the epipod are numerous. The second maxillipeds have 

 the second joint not twice as long as broad, with a plumose seta at 

 the apex of its inner margin, a short third joint, the fourth as long 

 as the fifth, with a plumose seta springing from a little prominence 

 on the side where a square marking gives a deceptive appearance 

 of an articulation, the sixth joint is subequal to the fifth, the much- 

 curved seventh has three strong teeth, the middle tooth the longest. 

 The third maxillipeds have a powerful second joint, bent, much 

 longer than the remaining joints combined, with three long plumose 

 setae on the slightly produced outer apex, the third joint very small, 

 the fourth much widened distally, the fifth much shorter than either 

 the fourth or sixth, but longer than the narrow seventh. 



The first peneopods are remarkable because the third joint, which 

 so often in appendages of the Sympoda gives trouble by its elusive 

 smallness, here has a length equal to that of the inner margin of the 



