REPORT ON THE AMPHIPODA. 989 



Lower Antennae with a short, broad, tapering flagellum of eighteen or nineteen joints. 



Mandibles.— The secondary plate on the left mandible has four strong teeth, on the 

 right mandible it is very feeble and minutely denticulate ; the spine-row consists of nine 

 spines, their apices diverging a little fanwise ; these are followed by a group of four seta- 

 like spines, the nearer two short, the others long ; the palp is broader than in Liljeborgia 

 haswelli, the first joint the broadest, the second longer than the first, with two spines on 

 the inner margin and four about the squarish apex, the third joint narrower than the 

 second, shorter than the first, with three spines on the outer, one on the inner, margin, 

 and three on the conical apex. 



First Maxilla}. — The very short first joint of the palp is almost overlapped by an 

 apically rounded process of the trunk of the maxilla. 



Second Maxillae. — The spines on the outer plate do not pass so far down the inner 

 margin as in the compared species. 



McixiUipeds. — The spine-teeth of the inner plate are fewer and larger ; the finger is 

 proportionately longer, compared with the first joint of the palp. 



First Gnathopods. — These and the following pair are a little less massive than in the 

 other species. 



Second Gnathopods. — The branchial vesicles shorter than the first joint. 



Second Perseopods. — The hind margin of the side-plates below the excavation with- 

 out a notch, except an almost imperceptible one where it curves round to meet the lower 

 margin. The third, fourth, and fifth perseopods differ from those of Liljeborgia haswelli 

 in regard to the first joint, which has the hind margin convex, in the fifth pair very 

 convex, and in all so minutely serrate as to appear almost smooth, in contrast to the deep 

 notching of the other species ; the fingers are very short, and a little curved ; the fourth 

 and fifth joints are fringed with long setae or seta-like spines, but on this stress cannot be 

 laid as a mark of distinction, since in the other species there are traces indicating the 

 possibility that these ornaments were once present. 



Pleopods. — Coupling spines small, apparently with two pairs of retroverted hooks ; 

 cleft spines four in number in one instance, five in another ; the joints of the rami sixteen 

 in number. 



Uropods. — Peduncles of the first pair longer than the rami ; the rami nearly equal, 

 the inner a little the longer; peduncles of the second pair about as long as the inner 

 ramus, which is broader and rather longer than the outer ; the peduncles of the third 

 pair shorter than the rami ; the rami broad, lanceolate, spined on both margins and 

 partialty pectinate, but very finely ; the outer ramus shorter and narrower than the 

 inner. 



Telson long and narrow, cleft almost to the base, the apices double, with two 

 small points, the inner reaching scarcely beyond the outer, a small spine and a spinule 

 occupying the interstice. 



