REPORT ON THE AMPHIPODA. 1105 



margin carrying nine spine-teeth, the distal margin four longer spine-teeth and three or 

 four setiform spines ; the first joint of the palp very short, the second long, with slight 

 spines at three points of the outer margin, and very many long ones along the inner 

 margin and adjoining surface ; the third joint longer than the first, widening distally, 

 the distal half carrying numerous spines ; the finger short, broad, with long apical spines 

 instead of a nail, the principal spine longer than the body of the finger ; the distal half 

 of the finger's lower margin fringed with long slender spines ; the dorsal cilium small, 

 very near the hinge. 



First Gnathopods. — Side-plates small, about as broad as deep, directed a little 

 forwards. The first joint almost free of the side-plate, with some spinules along the 

 slightly concave and pectinate front margin, and a slender spine and spinules at the apex 

 of the convex hind margin ; the second joint short, with a small group of spines at the 

 middle of the hind margin and a group of several long ones near the apex ; the third 

 joint with spines on both margins, and on the inner surface, especially across the distal 

 margin ; the wrist longer than the hand, widening distally, the hinder margin fringed 

 with many long spines, and the inner surface carrying many groups ; the hand a little 

 broader than the wrist, the hind margin, palm included, much more convex than the front, 

 fringed with six groups of long spines ; the inner surface carrying six groups of long 

 spines in the neighbourhood of the front margin, and four or five smaller groups 

 near the centre ; the palm finely pectinate, set with some palmar spines and many 

 spinules in addition to the groups of long spines ; the finger broad, curved, the inner 

 margin having about eight decurrent teeth, and fitting closely to the palm ; the dorsal 

 cibum small, near the base. 



Second Gnathopods. — Side-plates small, much larger than the first pair, breadth and 

 depth about equal, with some spinules along the lower and hinder margins. The 

 branchial vesicles about as long as the first joint, and rather wider. The marsupial 

 plates narrower than the branchial vesicles, a little longer, fringed with about forty 

 setae. The first joint nearly free from the side-plate, with spinules along the margins ; 

 the second and third joints less strongly spined than in the first pair ; the wrist and hand 

 together as long as the wrist and hand of the first gnathopods, but here the wrist smaller 

 and shorter, the hand longer and larger ; the wrist triangular, rather longer than broad, 

 distally cup-like but not broadly, with spines at the apex of the front margin, three large 

 groups along the serrate hind margin, and a still larger group about its apex and on the 

 lower margin adjacent ; the hand longer than broad, widening out from the wrist, the 

 greatest breadth at the commencement of the palm, which is long, oblique, forming an 

 obtuse angle with the hind margin, defined by four palmar sjrines, fringed with spinules 

 and groups of long spines, and denticulate, two larger teeth rising amidst the smaller ; 

 besides some surface groups, there are spines at intervals along the convex front margin 

 of the hand, and the serrate hind margin has nine or ten groups ; the finger is strong 



(ZOOL. CHALL. EXP. — PART LXVII. — 1888.) Xsx 139 



