ISOPODA. 55 
In general appearance this species greatly resembles the last, but it is instantly 
recognised by the fact that the first segment of the mesosome has its epimera produced 
into a single narrow blade only. 
The cephalosome is rounded, narrower than in the Coulman Island species, which is 
figured on Plate IX., and the ocular peduncles are shorter and stouter. They do not 
reach to anything like the distance of the epimera of the first segment of the mesosome. 
The mesosome is more distinctly setose than in the last species. The dorsal 
ridges, with their median spines, are more strongly developed. The urosome is, in its 
distal portion, prolonged into a definite terminal spine, and is densely setose. Both 
pair of antennz appear to be very similar to those of the preceding species. 
The pereiopoda are similar. The first pair are short and stout, prehensile in 
function, the basis is rather long, the ischium not half the length, and the merus 
shorter than that. This joint is expanded dorsally over the base of the carpus, and 
carries several stout sete. The carpus is a stout joint, swollen ventrally and armed 
with setee and two or three spines. The propodus is scarcely as long, stout and 
setose ventrally. The dactylus has a stout base, a comparatively slender claw, with 
an accessory spine and two curved sete. 
The remaining pereiopoda are distinctly ambulatory in function and have the 
normal cylindrical joints, excepting only the merus, which preserves its peculiar 
character and carries a spine dorsally. The carpus is stout and slightly swollen 
dorsally, with one or two spines and a few sete ventrally, and the propodus 
is longer, more slender and slightly curved, with a few setee ventrally. The dactylus 
retains its accessory spine and two curved setz throughout. 
There is but a single specimen of this species, taken at Winter Quarters in 125 
fathoms. 
NOTOXENUS. 
Body much vaulted anteriorly, widening conspicuously to the third segment of the 
mesosome. 
Cephalosome rounded, smooth, with long and slender ocular peduncles. Eyes 
very small. 
Antennze. Second pair with a peduncle of six joints, no accessory appendage. 
Mesosome. First four segments straight or very nearly so, three posterior segments 
recurved. No special interval between any of them. A mid-dorsal spine on each. 
Metasome. One very small segment and a large urosome with diminutive pre- 
terminal uropoda. 
Pereiopoda. The first prehensile, the remainder ambulatory, not unduly long. 
This genus is closely allied to Coulmannia of this Report, in fact I have long 
hesitated about separating them, but the bodily form which should be of greater 
importance than variation among the appendages, I think, quite justifies the course 
adopted. 
