REPORT ON THE AMPHIPODA. 993 



joint of the palp is more than twice as long as broad, the second joint is long, much 

 curved, the outer margin concave, the convex inner margin fringed with slender pectinate 

 spines, of which one near the centre is very long ; the third joint is shorter than the 

 second, both margins a little convex, the inner and the narrow truncate apex set with 

 rows of finely pectinate spines. 



Lower Lip. — The principal lobes distally narrow and strongly ciliated both there 

 and on the inner margins, widely dehiscent ; the inner lobes tumid, broad at the top, 

 and much ciliated ; the mandibular processes long, the outer margin making an elbow, 

 the apical flat, sloping outwards. 



First Maxillse. — The inner plate small, with a single plumose seta at the apex ; the 

 outer plate widening distally, the distal margin oblique, carrying seven spines, the 

 first long, seta-like, plumose or furry, the four following shorter, slender, with curved 

 tips, the next very much stouter, the last again both longer and stouter, quite out of 

 proportion to the rest ; submarginal to the last but one is an eighth very slender 

 curved spine, smooth-edged like the other six ; the first joint of the palp longer than 

 broad, the second curving round the outer plate, widening almost fan-like to a great 

 breadth distally, the distal margin being set round with twenty small spine-teeth, 

 accompanied by some setules which are continued down the inner border. 



Second Maxillee. — The inner plate rather longer and considerably broader than the 

 outer, with the apex and most of the inner margin fringed by four and twenty very long 

 plumose setae, the outermost at the apex being shorter than those which immediately 

 follow, but otherwise the size diminishing with great regularity from the apex down- 

 wards ; the strap-shaped outer plate carries three similar seta? on the truncate apex. 



Maxillipeds. — The inner plates rudimentary, rather longer than broad, the narrow 

 truncate apex tipped with two long seta? ; the joint which bears them is very short 

 compared with the elongate second joint ; this is fringed on both margins with numerous 

 spinules or setules, and on the outer surface near the slightly concave inner margin armed 

 with numerous very long setae ; the plates are about one-third of the total inner length of 

 the joint, very little longer than broad, not reaching beyond the first joint of the palp, 

 the slightly convex distal margin fringed with long spines, the series of spinules being 

 resumed on the outer margin ; the first joint of the palp i3 short, the second much 

 longer, fringed on the inner side with very many long seta? and spines, and short setae 

 on the outer side ; the third joint not longer than the first, fringed like the second ; the 

 finger not so long as the third joint, with spinules along the inner margin ; the full 

 breadth of the palp is not seen in the figure. 



First Gnathop>ods. — Side-plates almost square, a little longer than broad, a little 

 broader above than below, the lower margin fringed with spine-like plumose setae. The 

 first joint reaching far beyond the side-plate, widest at the distal end, the front apex of 

 which is rounded, both margins fringed with various spines ; the second joint with spines 



(ZOOL. CHALL. EXP. — PAliT LXV1I. — 1887.) Xxx 125 



