REPORT ON THE AMPHIPODA. 721 



to II pointed or bifid apex, with two spines on the outer margin ; outer plates rather 

 longer than the inner, with a small seta at about one-third of the length of the inner 

 margin from the base, and two larger at about two-thirds ; the apex almost pointed, 

 spinules at intervals on the slightly serrate outer margin. First joint of the palp the 

 same width as the second, with one small seta on the inner margin ; the second with a 

 small one, followed by a larger on the inner margin not far from the apex ; the third 

 joint more slender, rather longer than the second, furred, apically tipped with four or 

 five set£e, and carrying one or two on the inner margin Ijelow the apex ; perhaps a minute 

 rudiment of a finger. 



First Gnathopods. — Side-plates not very broad, incision for cilium on the hind 

 margin a little above the rounded lower margin. First joint reaching a little below 

 the side-plate ; second joint rather longer than the wrist, with setiB at two points on the 

 hind margin ; third joint minutely furred behind, with one apical seta ; wrist broader, 

 but much shorter than the hand, furred behind, with one apical seta ; hand tapering, 

 without palm, carrying spines or setse at five points on the hinder minutely pectinate 

 margin, the front margin having two or three cilia ; the finger more than half the length 

 of the hand, slender, with a slender naU. 



Second Gnathojoods. — Side-23lates narrower, a little longer than those of the 

 preceding segment. The branchial vesicles as long as the first joint of the limb, 

 which reaches below the side-plate, and about 3C[uals in length the third, fourth, and 

 fifth united ; the second joint as long as the hand, not quite so long as the wrist ; the 

 third joint short, but longer than the third joint of the first gnathopods ; the wrist 

 furred, without spines or setae ; the hand elongate, widening a little towards the 

 apex, furred, carrjring scale-like cilia on the breast ; the apex of the front margin 

 carries three or four spines over-arching the minute finger, this being a small triangle 

 with hooked nail at the apex, which antagonizes with the produced front portion of the 

 hand, thus forming a feeble chela. 



First Perseopods. — Side-plates narrow, similar to those of the preceding segment. 

 First joint not reaching the lower margin of the side-plate ; third joint broad, as long as 

 the fifth, not decurrent, with a seta on the hinder margin, and an apical seta or spine on 

 the front ; fourth joint a little broader but much shorter than the fifth, hind margin 

 pectinate and apically carrpng a spine, a cilium, and a setiform spine ; fifth joint scarcely 

 tapering, hind margin pectinate, carrying at two points short acute spines, and at the 

 hinge of the finger a pair of blunt curved ones ; finger more than half the length of the 

 fifth joint. 



Second Perwopods. — Side-plates longer and somewhat broader than those of the 

 preceding segment, the excavation behind not broad but carried far down, the margin 

 below it bending forwards. The branchial vesicles simple, much longer than broad. 

 The joints of the limb similar to those of the preceding pair. 



(ZOOL. CHALL, EXP. PART LXVII. 1887.) XsS 91 



