230 DR. C. CHILTON ON THE SUBTEEEANEAN 



bears a very oblique row of about twelve * finely plumose setae similar to those on the 

 inner lobe of the first maxilla ; the inner margin of this lobe is fringed with many simple 

 setse and the surface of the lobe bears a few very fine simple setse scattered over it. The 

 outer lobe bears many long curved setse at the extremity as usual ; many, if not all, of 

 these are finely serrate on the inner side. 



The maccillipedes (figs. 14, 15) are somewhat slender. When viewed from below 

 (fig. 14) the first joint [coxa) is seen to bear three setiB on the outer margin. The 

 next joint, the bases, is obliquely articulated with the coxa and bears near its base a 

 short transverse row of short setoe, and at its extremity towards the inner margin a 

 dense row of stout setae. The meros is rather longer than broad and bears a single seta 

 on its inner margin at the extremity. The carpus is about as long as the three preceding 

 joints together, and more than twice as long as broad ; its outer margin is regularly curved 

 and bears no setae ; the inner margin is nearly straight and is thickly fringed with setae, 

 which are chiefly arranged in irregular, short, transverse rows containing about two 

 or three setae each. The propodos is rather more than half as long as the carpus ; on its 

 outer margin at the extremity it bears two or three very long setae and its inner margin 

 is thickly fringed with long setae irregularly arranged in tufts. The dactylos is very 

 nearly as long as the propodos ; it is strongly curved and very acute ; the outer margin 

 bears a fairly long seta near the base, and the inner margin bears three small setae, the 

 third situated at the base of the terminal unguis, which is distinctly marked off from the 

 rest of the dactylos. 



When seen from above (fig. 15) the carpus bears at the extremity an oblique row of 

 four or five long setae and another similar row on the surface at some distance from the 

 extremity ; the propodos has a longitudinal row of about twelve long setae along the centre 

 of the upper surface (just like that which Humbert draws in Niphargus puteanus, var. 

 iorelli [62, pi. vi. fig. 9]), and a small tuft of two setae near the outer margin. The inner 

 lobe of the maxillipede— that is, the one attached to the basos — is rectangular, and bears at 

 the end three stout spines and five or six longer stiffly-plumose setae ; the inner margin 

 also bears three or four similar plumose setae. The outer lobe attached to the ischium 

 bears on the inner margin about twelve stout spines, which, at the extremity, gradually 

 merge into long denticulate setae ; a few simple setae are found along the inner margin, 

 more particularly on the basal portion. 



The gnatliopoda are about equal in size and almost identical in structure and in the 

 arrangernent of the setae on them, but the setae on the inner surface of each are more 

 numerous than, and very different from, those on the outer surface and require separate 

 description. 



T\\Q first gnathopod (fig. 16) has the coxa (side-plate) nearly square, the lower surface 

 bearing a few fine setae. The basos is long, the front margin with a few irregular setae, 

 the posterior margin with a tuft at the extremity. Iscliivim very short, with a tuft 

 of setae on the posterior margin at the extremity, and this is extended into a short row 

 along the inner surface of the joint. Meros narrow when seen from the outside, being 

 partially overlapped by the carpus ; on the inner side it appears nearly rectangular, the 



* !^eo note on previous page. 



