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transverse, and bears four or five setie at the outer distal angle 
and two others at the inner distal angle. The meros is subtri- 
angular, having the outer angle produced nearly to the end of the 
carpus, while the inner edge is only as long as that of the ischios; 
the inner distal angle is rounded and bears about 6 or 7 setae* the 
outer distal portion of the joint is somewhat concave for the 
reception of the carpus, and has the margin fringed with long 
sette. The carpus is somewhat sunk in the meros, it is narrowed 
at the base but widens distally and has the end truncate ; the 
inner margin is densely fringed with two or three irregular rows 
of setie and there is a small tuft at the outer distal angle. The 
propodos is elliptical, widest towards the distal end ; the inner 
margin, like that of the carpus, is fringed with setie, the outer 
margin bears six long seta; towards the distal end. The dactylos 
is broad and elliptical and arises from a slight concavity at the 
end of the propodos ; the whole of the inner margin and the distal 
half of the outer margin are fringed with long setie, those at the 
apex being the longest and also the stoutest. 
From the description given above it will be seen that the max- 
illipedes of Phreatoicus bear a close general resemblance to those 
of Asellits aquations. 
Th q first thoracic ley (or first ynatliopod). (Plate xxiv., figs. 5 
and 5a.) — This appendage has the dactylos bent back upon the en- 
larged propodos so as to form a powerful subchelate hand similar 
to that found in many Amphipoda. This form of limb is not so 
common among the Isopoda , but is found in several genera such as 
Anthura , Asellus tfcc. The basos is strong, about two and a half times 
as long as the greatest breadth, somewhat constricted near the base ; 
on the anterior margin is a row of 5 or 6 long simple setie, and 
there is a tuft of similar setie at the postero-distal angle. The 
ischios is rather more than half as long as the basos, and is sub- 
rectangular, slightly narrowed proximally ; there is a tuft of long 
simple setie about the middle of the anterior margin and two 
smaller tufts on the posterior margin. The meros is sub triangular 
and is produced anteriorly and distally into a rounded lobe 
partially surrounding the carpus and fringed all round with long 
simple setie, it also bears a tuft on the posterior margin. The 
carpus is also subtriangular and has the posterior margin supplied 
with a fringe of long setie, sometimes indistinctly separated into 
two tufts, the junction of the carpus with the propodos is oblique. 
The -propodos is very large and ovate, the anterior margin strongly 
convex with a small tuft of setie at the base of the dactylos and 
another placed more proximally ; the palm is oblique, somewhat 
convex and occupies about two-thirds of the posterior margin but 
is not clearly defined ; it is armed with a row of stout and very 
acute spiniform setie, and also bears a row of long simple setie, 
three or four tufts of setae are situated on the surface of the pro- 
podos near the palm. The dactylos is stout and fits closely on to 
