REPORT ON THE AMPHIPODA. 1083 



Eyes narrow and small, reniform, set obliquely on the lateral lobes of the head. 



Upper Antennae. — The first joint longer than the head, tapering distally, with spines 

 at five points of the lower margin, a row of feathered cilia near the base of the convex 

 upper margin ; the second joint thinner, but much longer than the first, with slender 

 spines at intervals on the lower margin ; the third joint scarcely half as long as the first ; 

 the flagellum of numerous joints, more than eighteen, together longer than the peduncle ; 

 the secondary flagellum slender, of seven slender joints, together equal in length to the first 

 four of the primary, the first and last joints the shortest ; the slender spines, both short 

 and long, as well on the flagellum as on the peduncle, have a conspicuous accessory thread 

 near the apex. 



Lower Antennae shorter than the upper ; the peduncle longer than that of the upper 

 antenna? ; the first two joints short, the gland-cone narrow, decurrent ; the third joint 

 longer than the preceding two united, with two groups of spines on the under side and 

 another at its apex ; the fourth and fifth joints thinner, much longer, about equal to 

 one another, a little shorter than the second of the upper antennae, armed with long 

 spines on the lower margin, and with short ones on both ; the flagellum of nine joints, 

 together not much longer than the fifth joint of the peduncle, tipped with setae or seti- 

 form spines and strong curved spines, which on the upper joints are long ; there are also 

 short spines on the sides of the joints. 



Upper Lip. — The distal margin broad, very slightly convex, and almost imper 

 ceptibly emarginate at the centre, being furred within and on either side of the 

 emargination. 



Mandibles. — Cutting edge broad, with six teeth, of which one is especially prominent ; 

 the secondary plate has four unequal teeth, which are strong on the left mandible, and long 

 on the right ; the spine-row of twelve long, strongly denticulate spines ; the molar tubercle 

 prominent, with long denticles surrounding the somewhat narrowed crown, and several 

 rows or ridges of smaller ones crossing the surface ; on the outside of the tubercle, above 

 the plumose seta, there is a small plate or process with a denticulate edge ; near to the 

 base of the palp there rises a prominent process with rounded apex ; the first joint of the 

 palp short ; the second long, fringed on two edges with numerous spines of various 

 lengths; the third rather shorter and much narrower, the apex acute, carrying one or two 

 long feathered spines, the front margin nearly straight, fringed with many spines, most 

 of them pectinate ; the outer margin convex, but a little below the centre somewhat bent 

 in, there being here a great group of cilia and pectinate spines, which give the joint the 

 appearance of being divided into two ; there are on the outer surface other groups of 

 spines both above and below the bushy group. 



Lower Lip. — The principal lobes are distally rather narrow and dehiscent ; from the 

 curve which may be reckoned either to the distal or inner margin projects a row of seven 

 close-set spines on one lobe and eight on the other, the two or three lowest having curved 



