REPORT ON THE AMFHIPODA. 895 



prominent one on the other ; the fourth joint longer than the preceding three united, 

 distally dilated and produced into large teeth, the lower margin carrying a small spine ; 

 the fifth joint as long as the fourth, a little dilated distally, with the lower apex acute, 

 the lower margin carrying a few spinules ; the flagellum with twenty-eight joints 

 remaining, of which the first is the longest and shows three or four joints in prepara- 

 tion within it. 



Upper Lip. — The distal margin broad, evenly and slightly convex, almost smooth ; 

 two blunt tooth-like processes project on either side of the surface of the epistome. 



Mandibles narrow and tongue-like, the cutting; edg;e resembling; a broad horny tooth 

 not divided into denticles ; even in the plates in preparation no such division could be 

 made out ; the secondary plate on the left mandible lies close to the lower edge of the 

 principal plate, and from a narrow base expands with a convex upper margin, its distal 

 margin sloping inwards like that of the principal plate, faintly divided into five or six 

 teeth, its greatest breadth about half that of the principal plate, against which it is 

 closely applied ; in the other mandible the secondary plate is similar in position but 

 much smaller, strap-like, not reaching the distal border of the principal plate ; of 

 spine-row I could discover no trace, nor could I make out any dentation of the molar 

 tubercle; the articulating process is large; the palp set far back, has the first joint rather 

 long, about half the length of the second, the third is longer than the first, shorter than 

 the second, with some spines on the oblique inner margin of the apex. In the figures 

 of the mandibles in situ on either side of the upper lip, the outer surfaces are shown, so 

 that the left mandible is to the right, the right mandible to the left ; the transparency of 

 the principal plates permits a view of the inner secondary plates. 



Lower Lip with the distal margin and much of the surface strongly ciliated, the lobes 

 dehiscent, with a small emargination near the apex of the convex inner margin; the inner 

 lobes so far as observed were narrow ; the mandibular processes long, a little' bent, very 

 diverg-ent. 



First Maxillae. — The inner plates oval, with ten or eleven plumose setae passing from 

 the apex some way down the inner margin ; the outer plate with a bush of cilia at the 

 upper part of the inner margin, many of them spine-like, and near the apex giving place 

 to broad short spines ; of the eleven spines on the distal margin, the two innermost have 

 ten or a dozen lateral denticles, the next pair have, the one three, the other four, stronger 

 teeth, the next pair two apiece, the next pair one and three, and the three outermost 

 which are strong and much curved have no lateral teeth ; the first joint of the palp is 

 long, half the length of the second ; the second reaches much beyond the outer plate, and 

 carries at the upper part of the inner margin and on the apex many long pectinate 

 spines. 



Second Maxillae. — The inner plates narrow at the base, then widening with a convex 

 inner and straight outer margin, the distal margin broad, obliquely truncate, crowded with 



