CRUSTACEA OF NEW ZEALAND. 191 



The two articulated lobes are similar and subequal ; they are oblong, with the extremi- 

 ties rounded. Each bears at the end and alon2^ the distal portion of the inner margin a 

 large number of long pectinated setae, which curve somewhat inward. On the outermost 

 setae, which are the longest, the pectinations which project at right angles to the setae 

 are very fine, but they become much coarser on the inner shorter setae. 



Various portions of the second maxilla bear very fine but rather long straight setae, like 

 those on the first maxilla. Those on the outer surface have already been described. On 

 the inner surface there is a large tuft on the l)asal portion toward the inner edge, and 

 two other tufts near the base of the outer articulated lol)e ; the inner margin of the inner 

 articulated lobe is also fringed with fine setse. 



The maxillipedes ffigs. 10, 11) ai-e large and appear more perfectly developed than 

 in most other genera of the Isopoda. In general structure they closely resemble those 

 of Phreatoicus av.stralis as well as those of P. typicus, but my original description and 

 figure [23, pi. iv. fig. 9] of the maxillipedes of the latter species are imperfect and based 

 on a partial misconception of the appendage. 



The first joint, the coxa, is irregular in outline, appearing more or less circular when 

 seen from the anterior side ; from it arises the large basos and, on the outer side, the 

 e])rpodite. This is a large flat plate reaching beyond the end of the ischium, irregularly 

 elliptical in outline, slightly emarginate at the distal end, the mai'gins being entire; 

 along the inner edge, when' it impinges against the basos, the margin itself and the 

 neighbouring portion of the outer surface are covered with very fine setae. Tlie basos, 

 when seen from the outside, is quadrangular, about twice as long as broad, the outer 

 margin fringed with fine delicate setse like those on the neighbouring portion of the 

 epipodite ; besides the portion of the basos thus seen, another portion almost at right 

 angles to it projects inward, and this is produced distally beyond the basos proper into 

 a large concave plate, reaching beyond the inner extremity of the meros and having its 

 convex surface tiu-ned inward toward the median line. The inner margin of this plate 

 up to the end of the basos proper is thickly fringed with fine delicate setae; beyond this 

 the whole margin of the distal portion of the concave plate is thickly fringed with large 

 plumose setae, those at the extremity being shorter than the others and more or less 

 pectinate instead of plumose. Many other setae, similar to these at the extremity, are 

 scattered over the distal end of the convex side of the plate. These setae probably form 

 straining apparatus of some kind. 



Near the base of the plate, a little beyond the extremity of the basos proper, are two 

 long " coupling-spines," slightly hooked at the extremity, very similar to those of Asellus 

 aquaticus, as described and figured by Sars [91, pi. ix. fig. 5"]. 



The iscJiium is short, transverse, with one or two setse at the extremity on the 

 inner edge. The meros is subtriangu.lar, produced at the outer side about halfway 

 along the carpus, and is somewhat hollowed distally to receive the carpus ; there are a 

 few rather stout setae on the outer margin at the extremity, and the inner margin is 

 convex and fringed with rather long setae. The carpus is somewhat sunk in the meros, 

 slightly narrowed at the base, the outer margin slightly sinuous and with a small tuft 

 of setae at the extremity, the inner margin convex and densely fringed with long setse. 



