448 Mr. G. M. Thomson on two new 
joint elongated and flattened, broadening upwards, with scat- 
tered sete along the margins, third joint shorter than second 
and broadened upwards, with a transverse crest of sete on the 
dorsal surface and a fringe of setw round the extremity and 
distal half of the lower margin, those at the apex of the joint 
very long. 
First maxille with the inner plate in the form of an ex- 
tremely short pointed lobe without any sete; outer plate 
broad, nearly square at the extremity, ending in ten short 
spines and a few minute sete; palp broad and flat, appa- 
rently three-jointed, the middle joint short, the extremity with 
a few short spines and setee. 
Second mazille with the outer plate slightly broader than 
the inner, setose at the extremity; the inner fringed with 
short sete, chiefly round the inner margin. 
Maxillipeds.—Inner plate reaching to the first joint of the 
palp, widening above and bearing on the extremities a few 
short broad spines, interspersed with short plumose sete, 
which are continued a little way down the inner margins; 
outer plates about subequal with second joint of the palp, 
haif as long again as the inner, broad and curved, furnished 
with numerous leaf-like spines and long simple sete; palp 
four-jointed, the three last joints furnished with numerous 
sete; last joint short and rounded, with one or two rather 
stout sete at the extremity, but without a claw. 
First gnathopods small; side-plates elongated, widening 
and rounded below, produced forwards at their infero-anterior 
angle; basos long and slender, front margin nearly straight, 
without sete ; ischium short ; meros produced into an acute 
tip, sparingly setose ; carpos well developed, subtriangular, 
broadest at the distal extremity, with several sete along its 
sides and numerous tufts on its lower margin; propodos 
shorter than carpos, narrow-ovate, the oblique and dentate 
palm occupying about. one third of the length, with numerous 
setee on both margins; dactylos about two thirds as long as 
propodos, curved, very acute, and furnished with a few minute 
denticulations along its inner edge. 
Second gnathopods very large, side-plates resembling those 
of the preceding pair; ischium and meros short, the latter _ 
produced forward like a tile, so that the carpos, which is 
attached almost at right angles to it, works in it as in a 
groove; carpos dilated distally, so as to have the form of an 
equilateral triangle; propodos large and subquadrate, its 
lower side straight and fringed with bunches of short sete, 
its anterior side dilated into a large rounded protuberance, 
furnished with a bunch of sete near the extremity and a few 
