ISOPODA. 
69 
papilliform teeth occur on the inner margin. The palp is five-jointed ; four joints are 
short and broad ; the terminal one is also short, and, though much more slender, it 
is more correctly described as a stump. The three central joints are each provided on 
the inner border with two or three long setae, and the third of the entire series is 
the largest. 
The pereiopoda, except the first, are uniform in structure. The first is short and 
comparatively stout; the basis is long ; the ischium little more than one-third the 
length ; the merus is quite short and expanded distally ; the carpus is a little longer, 
much expanded ventrally to form a round “ cutting ” edge which carries two stout 
spines. The propodus is a little longer still and similarly expanded ventrally, but not 
quite throughout the entire length of the joint; the dactylus is about as long, slender, 
and bears a slender claw distinct from the joint and a much smaller though distinct 
accessory. A few setae are scattered throughout the appendage. 
The other appendages are slender, but not so long as the body. The basis 
is little longer than the ischium; the merus is short and swollen dorsally. 
The other joints are comparatively long and become increasingly slender ; the 
propodus is a little longer than the carpus, and each of these have two spinous 
setae ventrally. The dactylus is slender, slightly curved, rather more than half as 
long as the propodus. 
The pleopoda are protected by a sort of hood formed by the urosome, and the 
first pair forms a shield to the rest. The ovigerous female is much broader than 
the male. 
Four specimens were taken in Winter Quarters inside the 20-fathom line in 
February, 1902. 
NOTOPAIS. 
Cephalosome broad and short, excavated in front and without eyes. 
Mesosome with the three posterior segments recurved, tapering and separated 
from the four anterior ones. 
Cephalosome and anterior segments of the mesosome spinose. 
Metasome a single plate with minute terminal uropoda. 
Pereiopoda, anterior ones ambulatory, posterior ones defective, very slender and 
not disproportionally long. 
Pleopoda, first pair opercular. 
The Munnopsidae ( Ilyarachna ), to which this genus should be assigned, are 
notorious for the natatory character of the posterior pereiopoda. A deficiency in 
this respect of this appendage is, therefore, serious. The genus Ilyarachna seems to be 
its nearest relation. 
