REPORT ON THE AMPHIPODA. 717 



fourth segment, which has a deep dorsal excavation, the end being strongly upturned, 

 with the process rounded behind. 



Eyes very small, components numerous, perhaps thirty. 



Upper Antennse. — Peduncle tumid, hairy above, the first joint as long as the rest of 

 the antennae, the second rather longer than the third ; the flagellum of five joints, with a 

 few cylinders, three or four on the first joint, which is shorter than the last of the 

 peduncle ; secondary flagellum of two short joints tipped with setse. 



Lower Antennw. — Gland-cone moderately prominent, with squared apex, third joint 

 short, fourth and fifth furred above, and carrying a few small setse, the fourth joint 

 longer than the fifth, the fifth as long as the four-jointed, rapidly tapering 

 flacjellum. 



Upper Lip hairy. 



Mandibles long and narrow, broadest at the base, cutting edge smoothly convex, 

 with a tooth above and a denticulate point below, spine-row containing apparently 

 seven spines in each mandible, unless the uppermost spine on the left mandible may be 

 supposed to represent a secondary plate ; the spine-row is followed immediately by a 

 ciliated tract perhaps representing the molar tubercle, above which is placed the process 

 which I regard as the equivalent of the articular condyle ; the whole shaft is dotted with 

 small cilia ; far from the spine-row, close to the base, rises the small three-jointed palp, 

 the first joint longer than usual, the third but little shorter than the second, tipped with 

 two setae, and having on the surface the customary adpressed cilia. 



Lower Lip with the mandibular processes ciliated. 



First Maxillse. — Inner plate narrow, with a single short seta on the apex ; outer 

 plate elongate, crowned with eight closely-set dentate spines, the innermost showing eight 

 lateral denticles ; the palp minute, two-jointed, so placed on the outer margin of the outer 

 plate that the tapering ciliated second joint projects a little beyond the apex of the 

 inner plate. 



Second Maxillie. — The outer plates rather longer than the inner, both with long 

 spines on the apices, the spines a little curved at the tips. 



Maxillipeds. — The inner plates not much shorter than the outer, the apical margin 

 running out furthest on the inner side, there carrying one or more teeth, followed by two 

 long spines at intervals on the outer margin ; the outer plate having a small spine or 

 seta on the inner margin about one-third of its length from the base, a group of three 

 setae at two-thirds, two or three little nodules close to the apex, and the outer rim 

 serrate or dentate for some distance down, lines or channels in the surface of the plate 

 leading to the serrations ; the first joint of the palp quite short., the second shorter than 

 the third, with a cilium and a seta near the top of the inner margin ; the third joint 

 slenderer than the second, but as long as first and second combined, with an apical tuft 

 of six or seven setae, and perhaps a minute rudiment of a fourth joint ; the palp forms an 



