REPORT ON THE AMPHIPODA. 665 



margins of second and third ciliated ; the fourth segment with a dorsal depression, the 

 sixth with lateral ridges on the back curving outwards at the telson. The specimen was 

 coiled almost into a circle. 



Eyes not made out with any certainty. 



Upper Antenna. — First joint tumid, very little longer than the second and third 

 united, these being short and thick ; flagellum of ten joints rapidly tapering, the first 

 stout and large, subequal in length to the following nine together, the brush formed by 

 some twenty-four rows of setse ; apically the first joint has a long slender spine, the 

 following joint having two such, the third joint two and a smaller one, the fifth joint two 

 of the smaller size, all the joints having spiniform cilia ; the secondary flagellum of six 

 joints, the first long, the six together as long as the first five of the primary ; some 

 spines at their distal ends. 



Lower Antennae. — First joint a little dilated below, the gland-cone small and little 

 prominent, third joint quite short, fifth joint thinner and rather longer than fourth, 

 neither very long, both ciliated on the upper margin ; flagellum of twenty-five joints. 



Upper Lip projecting a little in a convex lobe between the mandibles. 



Mandibles broad in front, the cutting edge long, very convex in the right mandible, 

 much less so in the left, having a prominent tooth at the top, angled below, with two teeth 

 or serrations on the lower margin behind the angle ; the secondary plate of the left 

 mandible placed high up, very small, strap-shaped ; spine-row of nine spines, below and 

 behind which a space on the outer surface of the mandible is armed with prickles ; molar 

 tubercle seemingly weak, tongue-shaped, produced far backwards, slightly ciliated, not at 

 all dentate (not shown in the figure); palp set some way back behind the spine-row ; 

 between the palp and the cutting edge the top border runs up into a great triangular 

 lobe, with the small articular condyle rising just over its apex ; the first joint of the palp 

 very short ; there are nine spines in the row at the upper part of the second joint ; the 

 third joint with the first equalling the length of the second, carrying fifteen spines on 

 the inner border. 



Lower Lip, the mandibular processes long and smooth, apically rounded. 



First Maxillse. — Inner plate bordered above with nine long plumose setae ; the outer 

 plate much longer than the inner, with its eleven spines all slender and long, among 

 cilia, two of them some way below the apex, those actually on the apex very elongate ; 

 the denticles of the spines not numerous, and not placed near the apices of the spines ; 

 the first joint of the palp very short, the second long, of tolerably even width, its apex 

 cut into five teeth, of which the three central very prominent, surmounted by little spine- 

 teeth, a little spine also in the cavity formed by the small inner tooth and a longer spine 

 at the outer almost obsolete tooth ; on the otiter margin, some way below the apex, a 

 long seta is inserted, and a shorter one near the tooth next but one to the outer mai'gin. 



Second Maxillse. — Inner plate much shorter than the outer, l)ordcred on the inner 



(ZOOL. CHALL, EXP. PART LXVII. 1887.) XxX 84 



