ISOPODA. 
61 
endopodite has a rather broad peduncular joint, followed by a second nearly twice as 
long, its inner margin is nearly straight, its outer margin makes a bold curve 
outwards, sweeping round to the irregularly truncated extremity, which is armed with 
three large plumose setse. The exopodite as a whole is falciform, it is composed of 
two joints, the basal one having an oblique extremity is very nearly as long as the 
entire endopodite ; the second joint bears a conspicuous mid-rib, also seen distally on 
the other, and tapers gracefully to a point; a few small setrn occur externally. 
The fourth pair has a small conical basal joint. The endopodite is long, curved 
and setose internally; it is composed of two joints, the distal one being about two-thirds 
the length of the other, it is armed distally with two blunt setse or rather spines. 
The exopodite is scarcely as long as the endopodite, it is spoon-like, and the inner 
margin is sinuous, the outer boldly curved, then tapering to a blunt point. The 
remainder are similar, but the exopodite becomes more concave or spoon-like. 
First pleopod of male. The sympodites are long narrow structures fused in the 
middle line. The external margins are curved inwards, dilating distally where they 
are deeply excavated and also appear to be tubular. This recess is occupied by a 
second joint, a thin ramus, the margin of which is ciliate. About three-fifths of the 
length of the sympodites there projects laterally an expansion from below. 
The second pair is not quite so long, the inner edge of each is straight, the 
outer edge rounded, the structure being about four times as long as broad. The 
outer border is very finely ciliate and fringed with small setrn at intervals within the 
edge. This sympodite is marked with two strong muscle bands, the inner one bends 
abruptly inwards, connected with a stout irregular structure which passes forwards, 
projecting from the sympodite to bend again backwards as a large pointed blade. 
This is the exopodite. The other, the endopodite, forms a lobe rounded posteriorly, 
and has what appears to be a tubular mouth. The remainder are as in the female. 
AUSTROMUNNA. 
Austrimunna Richardson (12), p. 19. 
This genus was instituted by Miss Richardson for a small Isopod found off 
Wiencke Island by the French Antarctic Expedition. The following is the second 
species assigned to the genus. 
Austromunna rostrata. 
(Plate X., fig. 3.) 
Specific characters:— 
Body ovoid. 
Cephalosome small, with a short rounded rostrum, and with eyes on elongated peduncles. 
Mesosome. Four anterior segments not widely separated from the three posterior, the three 
anterior segments rvith large truncated epimera. 
Urosome broader than long with minute dorso-lateral uropoda. 
The body is compact, ovoid in shape. 
