REPORT ON THE AMPHIPODA. 845 



Lower Antennae mucli stouter aud longer than tlie upper ; a small gland-cone on the 

 second joint just below the slightly expanded portion of the first joint ; the third joint 

 about equal in length to the coalesced first and second, carrying numerous setae ; the fourth 

 joint longer than the preceding three united, not much shorter than the flagellum of the 

 upper antennae, with two very long spines on the side, one below the centre, the other 

 almost distal, also a short s^^ine on the upper margin near the distal end, and all along 

 this margin spinules or setules which like the spines are hairy ; the fifth joint as long as 

 the first three united, armed with some large spines, two of them very long, and with 

 numerous setules and long feathered cilia ; the flagellum of about sixty-five joints, thick 

 at its base and tapering slowly, in every joint except the first two or three and the last 

 dozen showing a small calceolus standing stiffly out on the upper distal end ; the above 

 description applies to the specimen figured on PI. LX.; in another specimen the long 

 spines are altogether absent, the fifth joint is only very little shorter than the fourth, 

 both are fringed all along beside the upper margin with small rows of setules scarcely 

 projecting beyond the edge ; the flagellum, not as in the other specimen shorter, but 

 longer than the peduncle, slender throughout, of seventy-four joints, armed only with 

 short cilia ; to this specimen, a very large one, belonged the upper antennae with the 

 bearded flas^ella. 



Upper Lip very broad, the rounded distal margin projecting at the centre in a 

 little point, the central space almost naked, but the tracts on either side of it strongly 

 furred. 



Mandibles. — Cutting plate with two or three large teeth at one end and a small 

 tooth at the other, the intermediate space smooth or slightly denticulate ; the secondary 

 plate in the left mandible with its edge divided into six strong teeth, in the right 

 mandible of much slighter structure with the edge divided into four slender teeth ; 

 the spine-row of six, seven, or eight slender, hairy, or denticulate spines ; the molar 

 tubercle large and prominent, with a small hairy tubercle at the upper corner in front, one 

 side of the more or less oval crown smooth-edged, the other finely dentate, the appearance 

 varying considerably according as the smooth or the dentate edge is shown outermost ; a 

 conical process stands between the molar tubercle and the palp. The first joint of the 

 palp short, the second long, stouter at the base than above, its hinder margin concave, 

 some long thin setae on the lower part of the front margin, along which are spines 

 of various lengths ; the third joint is not shorter than the second, bordered with short 

 spines along more than the upper two-thirds of the front margin, with long spines at the 

 apex, and a long spine near the base behind, or with two such spines. 



Loiver Lip broad ; the principal lobes broad, the forward margins broad, slightly 

 curved, densely furred ; the inner margins with their anterior portions nearly straight, 

 standing widely apart, the interval being partly filled by the front margins of the inner 

 lobes ; the mandibular processes bluntly pointed. 



