REPORT ON THE AMPHIPODA. 947 



first joint of the flagellum. but resembling it in general appearance ; the flagellum 

 longer than the peduncle, consisting of twelve joints of various lengths, and, except the 

 two end ones, all nearly of the same thickness. 



Lower Antennae shorter than the upper. The first three joints short, the gland- 

 cone small but prominent ; the fourth joint rather shorter than the second of the upper 

 antenme, narrowing a little distally, carrying two or three small spines ; the fifth joint 

 a good deal shorter and narrower than the fourth, widening distally, having a spine at 

 the apex of each margin, and a small one in the middle of the upper margin ; the 

 flagellum shorter than the peduncle, tapering, of five unequal joints, the first longer 

 than the second and third united, the fourth longer than either of them separately. 



Upper Lip. — The distal margin convex, the central part with minute cilia, longer 

 ones on either side of the centre pointing inwards as usual. 



Mandibles. — The cutting edge divided into seven unequal teeth, the secondary plate 

 into four short teeth in a row with a slender spine-like tooth facing them on the left 

 mandible, into four irregularly grouped on the right mandible ; the spine-row consisting 

 on the left mandible of three, on the right of two, denticulate or plumose spines ; on 

 the right mandible the molar tubercle with the dentate crown irregularly four-sided ; on 

 the left mandible the molar tubercle presenting a rather flattened appearance, with 

 eight or nine rather strong but irregular teeth round part of the margin ; palp wanting. 



First Maxillae. — The spines on the outer plate seem to be eleven in number, with 

 lateral denticles to the number of three or four on some of them ; the first joint of the 

 palp short, the second tolerably long but not reaching beyond the outer plates, carrying 

 on the narrow apex two long uneven setiform spines. 



Second Maxillae. — The outer plate has two spines placed apart on the outer 

 margin, as well as many on the apical margin. 



Maxillipeds. — The inner plates, so far as could be made out, are very small, not 

 reaching so far as the distal end of the palp's first joint ; the outer plates very large, 

 completely covering the palp, the inner margins smooth and not dehiscent for a 

 considerable distance ; on the distal half there are three small spines which closely 

 interlock with those opposite ; these are followed by a row of three or four stout spine- 

 teeth, which also interlock, the margins then becoming dehiscent, serrate, with five long 

 curved spines on each ; the outer margins are convex, the greatest breadth of the plates 

 nearer the distal end than the base ; the first joint of the palp is short, carrying a 

 long spine ; the second joint with some long spines on the inner margin, chiefly on the 

 distal half; the third joint about as long as the first, with some spines on the distal 

 half of the inner, and on the apex of the outer, margin; the finger much shorter than 

 the third joint, with a small nail, and a setule at the base of the nail. The palps, as 

 shown in the figure mxp., were seen through the partially transparent outer plates. 



First Gnathopods. — The side-plates much deeper than broad, the front and lower 



