REPORT ON THE AMPHIPODA. 780 



Syrrlwc papyracea, n. sp. (PI. L.). 



The Head bent down, with a rounded corner over the first joint of the upper antennae, 

 forming a depressed rostrum, sharp-edged, and acute at the apex, at right angles with the 

 top of the head ; the first five segments of the perason very short ; the first three of the 

 pleon very long, the postero-lateral angles a little produced and very acute in the second 

 and third, not produced in the first ; the last segment of the perseon and the first four of 

 the pleon-segment are provided with a sharp dorsal tooth on the hind margin, small in 

 the first of these segments, with about eleven denticles on either side, larger in the next, 

 with thirteen denticles on either side, a little longer still in the next, with as many or more 

 attendant denticles, very small in the two following segments, with a diminished number 

 of denticles; the fourth segment of the pleon is long at the upper part, longer than the 

 two following united. The integument dotted with small round spots in various parts, 

 elsewhere presenting the appearance of finely ribbed silk ; the first joints of the last 

 perseopods showing prismatic colours. 



No Eyes perceived. 



Upper Antennse. — The first joint rather thick, a little bent, twice as long as broad, 

 with several setules on the upper margin and the apex of the lower; the second joint 

 thinner and a little shorter, the third three-quarters the length of the second ; fifteen 

 joints of the flagellum remaining, together longer than the peduncle, the first joint much 

 longer than the rest, shorter than the third joint of the peduncle, smooth ; the secondary 

 flagellum three-jointed, the first joint longer than the first of the primary, the second 

 nearly as long, reaching to the end of the fourth joint of the primary, the third very small, 

 tipped with long setse. 



Lower Antennas. — First joint a little expanded, second with a well-developed gland-cone, 

 third not longer than the second ; fourth narrow, elongate ; fifth as long as the third and 

 fourth united ; flagellum of eighteen unequal joints, more or less alternately long and short, 

 with some long setse at the apices of some, the joints together not so long as the peduncle. 



Upper Lip with the distal margin not in the least insinuate, forming a rounded apex 

 to an equilateral triangle, the apical border furred very finely, the hairs as usual on the 

 right and left pointing towards the centre. 



Mandibles. — Cutting plate with a long scarcely indented edge ending in two strong 

 teeth below; the secondary plate narrow, cut into four teeth, stronger on the left than on 

 the right mandible ; spine-row of six spines, the first three stronger than the others ; the 

 molar tubercle strong and prominent, the front edge sinuous, with one or two teeth 

 stronger than the crowd of denticles, the hind margin nearly straight, with a compara- 

 tively small seta; the first joint of the palp short, the second very long, narrowing a little 

 distaUy, fringed with setae, the third joint short, almost rudimentary, tipped with four or 

 five very long setae. 



