REPORT ON THE AMPHIPODA. 1005 



thin plate projects, with a finely denticulate edge (this minute feature I left unfigured, 

 supposing it due to an accidental laceration, but it is found also in Autonoe, Gammar- 

 ojms, Podocerus, Cera/pus, Platophium) ; there is a process above the molar tubercle 

 near the base of the palp ; the first joint of the palp is short, widening distally, rather 

 longer than broad ; the second joint is large, armed on the inner margin or adjacent 

 surface with about a dozen spines of different lengths ; the third joint is nearly as 

 long, widening distally to considerably more than the width of the second joint, the 

 lower part of the inner margin nearly straight, unarmed, the remainder as far as the 

 apex curved, set closely with numerous long spines, some slightly plumose, most of them 

 strongly pectinate ; the outer margin is very slightly convex ; adjacent to it on the inner 

 surface some way below the apex is a row of four long spines, while on the outer surface, 

 besides a continuation of this group, there are spines at five other points lower down and 

 away from the margin, the set consisting of two pairs and three single spines. 



Lower Li}). — The principal lobes ciliated round the distal and inner margins ; the 

 inner plates thick, distally rounded and broad, narrowing to the base ; the mandibular 

 processes small, rather divergent. 



First Maxillse. — The inner plate broad at the base (but a view of this breadth not 

 easily obtained), with a setule on the narrowly rounded apex ; the outer plate carrying 

 on the distal edge ten slightly denticulate spines ; the first joint of the palp very short, 

 the second long, curving over the outer plate, its distal margin carrying four strong, 

 variously cut spine-teeth, and a slender spine-tooth in the inner corner ; there are 

 besides three submarginal spines, slender, pectinate on two edges. 



Second Maxillse. — The inner plate shorter and narrower than the outer, with 

 thirteen setae passing across from the base of the inner margin in a curve towards 

 the outer apex, the upper part of the inner margin fringed with spines, the apical margin 

 flattened and unarmed ; the outer plates broadest at the rounded apical margin, which is 

 fringed with many spines. 



Maxillipeds. — The inner plates short and broad, not cpiite reaching the distal end 

 of the palp's first joint, fringed with setae along the distal part of the inner margin, on 

 the outer surface of which there is a spine-tooth just below the apex ; the broad 

 straight distal margin has three irregular spine-teeth, and many slender feathered 

 spines ; the outer plates do not reach the distal end of the palp's second joint, the 

 inner margin has seven spine-teeth, the series being continued round the distal margin 

 by six longer teeth or spines ; there is as usual a row of slender spines on the outer 

 surface within the inner margin ; the first joint of the palp is short, the second long, 

 with many long spines on the inner margin and outer surface ; the third joint is as long 

 as the first, distally widened, set about the apex and surface with long spines, of which 

 one at the apex is conspicuously pectinate ; the finger is longer than the third joint, if 

 a long pectinate spine which appears to do duty for a nail be included ; this spine is as 



(ZOOL. CHALL. EXP. — PART LXVII. — 1887.) Xxx 134 



