ISOPODA. 61 



endopodite lias 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 setse 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 setse 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 

 Wieucke 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 with large truncated epiniera. 



Urosonie broader than long with minute dorso-lateral uropoda. 



The body is compact, ovoid in shape. 



