REPORT ON THE AMPHIPODA. 1199 



on the distal margin, the lateral denticles of the spines few and not prominent ; the first 

 joint of the palp short, the second joint long, with six rather long spine-teeth, the 

 outermost longest, on the distal margin, and two or three slender spines at the inner 

 corner ; some longer setiform spines on the surface. 



Second Maxillae. — The inner plate shorter than the outer. 



Moxillipeds. — The inner plates reaching about to the apex of the first joint of the palp, 

 with feathered setae on the inner margin, and on the broad distal margin some feathered 

 spines and two short spine-teeth which are set wide apart ; the outer plates broad, 

 reaching beyond the middle of the second joint of the palp, having on the inner margin 

 several spine-teeth not set very closely together, and followed on the apical margin by 

 some longer curved spines ; the first joint of the palp short, the second twice as long, not 

 very strongly armed, the third a little longer than the first, extended over the base of the 

 very short and small conical finger, the truncate tip of which carries some spines which 

 are longer than the body of the finger. 



First Gnaikopods. — The first joint almost free from the side-plates, as is usual with 

 all the limbs of the perseon in this genus ; equal in length to the wrist or the hand, but 

 narrower than either, narrowest at the neck, the margins almost entirely unarmed. The 

 second joint longer than broad, with a few setiform spines on the lower part of the hind 

 margin, and a group of three spines on the surface near the upper part of the front 

 margin ; the third joint broader than the second but not longer, tending to diamond- 

 shaped, the convex hinder margin fringed with long pectinate spines, the surface having 

 two groups ; the wrist subequal in length to the hand, with two or three groups of long 

 spines on the surface near the long front margin, and a few other groups elsewhere on 

 the surface ; the convex, gently crenate hind margin fringed with long feathered spines, 

 twenty or more ; the width of the wrist is greatest where it becomes free from the third 

 joint, and lessens very gradually till quite at the distal end ; the hand, starting from a 

 narrow neck, widens immediately to its greatest breadth, and thence narrows gradually 

 till at the distal end it is as narrow as at the base ; there are several groups of long 

 spines on and adjacent to the convex front margin, and on various parts of the surface,, 

 especially near the apex ; at the greatest breadth, and therefore not far from the base, 

 the long, crenate, slightly convex palm margin begins, and is bordered with a great 

 number of long feathered spines, but also it is ornamented and armed by a row of ten 

 palmar spines with serrate edges, set close together, not on the margin, but so far 

 within the surface that the tips of most of them project beyond it; the long and strong 

 finger matches this margin and has the distal half of its inner margin set with about a 

 dozen slightly decurrent spine-teeth, its tip being formed by a small curved nail ; the 

 outer margin is convex. 



Second Gnathopods much larger than the first. The first joint narrow at the neck, 

 then widening so as to be much broader though it is not longer than the first joint in 



