ISOPODA. 61 



eudopoditc has a rather Itroad 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 setic. The exopoditc as a whole is falciform, it is composed of 

 two joint-*, the basal one having an obli(|ue extremity is very nearly as long as the 

 entire endopodite ; the second joint bears a conspicuous mid-ril>, also seen distally on 

 the other, and tapers gracefully to a point ; a few small setai occur externally. 



The fourth pair has a small conical basal ytiut. 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 seta) 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 curvcil, tlien 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 exuivated and also appear to be tul)ular. This recess is occupied by a 

 second joint, a thin ramus, the margin ol" wliicli 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 setas at intervals within the 

 edge. This sympodite is marked with two strong muscle bands, the inner one bends 

 abruptly inwanls, connected with a stout irregular structure which passes forwards, 

 projecting from the .sympodite to bend again backwards as a large pointed Ijlade. 

 This is the exopodite. The other, the endopodite, forms a lobe rounded posteriorly, 

 and has what appears to be a tuljular 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 tlie French Antarctic Expedition. The following is the second 

 species a.ssigned to the genus. 



Au.STROMUNNA ROSTRATA. 



(Plate X., fig. 3.) 

 Specific characters : — 

 IJody ovoiii. 



Cephalosoine small, with a short rounded rostrum, ami witli eyes on elongated peduncles. 

 Mcsosorue. Four anterior scfrnients not widely separateil from the three posterior, the three 

 anterior ee^'ment.s with large truncated tpimera. 



Urosouie l^roader than long with ininnle dorso-lateral uropoda. 



The body ia compact, ovoid in shape. 



