ISOPODA. 65 
four specialised sete: of varying length and bearing extremely delicate subsidiary 
setee ; the outer lobe, twice the size, is armed with several stout spinous sete, each 
having a serrated inner margin. 
The second maxilla consists of a comparatively large inner lobe, the inner margin 
of this is rounded distally and bears several slender spinose sete, two of which, the 
innermost, are the longest and dentate; of the two outer lobes the innermost bears 
three slender, tapering and minutely serrated sete, the other bears four. 
The maxillipeds show a broad masticatory lobe upon a short basal joint of quite 
normal structure, the inner straight margin carries two papilliform teeth and distally 
there are a few dentate sete; these are very minute. The palp is five-jointed, all 
the joints are slender and comparatively long. The epignath is long, rather spindle- 
shaped, most swollen on the outer side, and it terminates in a blunt point almost 
abreast of the distal border of the masticatory lobe. 
The pereiopoda are short. 
In the first the basis is a little longer than the ischium, both are slightly curved 
and quite smooth; the merus is short, expanded dorsally and carries a few stout sete 
distally ; the carpus is a little shorter with a stout spine ventrally; the propodus is 
rather longer with two such spines ventrally and a few delicate sete distally ; the 
propodus is stout with a strong claw and an equally strong though much shorter 
accessory with a fine seta between the two. 
The second pereiopod differs in that the carpus is quite as stout as, but longer 
than, the merus; this latter bears one stout spine dorsally and a few fine sete 
ventrally, the carpus bears several scattered sete, strongest dorsally. 
The third and fourth do not differ essentially ; the fifth is rather longer, and the 
carpus bears four short and stout spinous setee ventrally and three long ones dorsally, 
the two following are a little shorter and less conspicuously spinous. The brood 
pouch is formed by broad lamellz on the second to the fourth appendages. 
A large number of specimens of this species were taken during our stay in Winter 
Quarters ; they were almost entirely picked out of the eons débris. 
Inside the 25-fathom line. 
AUSTROSIGNUM. 
Cephalosome sub-rotund, much narrower than the first segment of the mesosome. 
Eyes small, on long slender peduncles. 
Antenne of moderate dimensions, peduncle of the second six-jointed, without an 
accessory appendage. 
Mesosome, the three posterior segments distinctly separated from the four 
anterior, recurved and diminishing in size. 
Metasome comprises a single independent segment and bulbous urosome often 
prolonged as a spinous process with minute preterminal uropoda. 
VOL. V. Q 
