REPORT ON THE AMPHIPODA. 851 



the spiuc-row consists of six or seven spines, of wiiicli some at least are pectinate ; the molar 

 tubercle is prominent, with strongly dentate crown of squarish-oval shape, with forward 

 margin more or less smooth, but in the right mandible carrying a projecting tooth above 

 and below; between the molar tubercle and the palp is a narrow, almost conical process ; 

 the first joint of the ^ialp short, the second as long as or longer than the first and third 

 united, stouter at the basal than the distal portion, with spines of varying lengths 

 along its front, the longest apical, a little curved and distally pectinate ; the third joint 

 has a long spine near the base behind, four shorter on the upper half of the front margin, 

 and three long ones at the apex. 



Lower Lip. — The principal lobes broad and shallow, widely dehiscent, tlie gap being 

 to a large extent occupied by the inner lobes ; the mandibular processes short and broad. 



First Maxillee. — Inner plate short and broad, bowed out on the inner side, narrowing 

 towards the apex, and carrying three slightly plumose setas, no one of which quite reaches 

 the apex ; the outer plate carrying nine spines on the truncate distal margin, the inner- 

 most long, with two lateral teeth, the next adjoining strongly furcate, the remainder 

 with one or two lateral teeth ; the first joint of the palp with two sette on its hind 

 margin, the second joint with two on the hind margin and many on the dentate 

 oblique apical margin ; in one of the specimens this palp was evidently a little abnormal 

 on one side of the mouth, having a single seta on the outer and two on or near the inner 

 margin. 



Second Maxillse short and broad. Inner plate broader and scarcely shorter than the 

 outer, carrying a couple of slender plumose setae near the centre of the inner margin, 

 just below which commences a row of setules, short spines and setae passing round the 

 upper part of the outer margin to the beginning only of the broad, almost flat, distal 

 border ; the spines of the inner plate begin but a little way down the inner margin, with 

 increased length occupy the distal border, though the longest are not outermost, and the 

 outer slope is occupied by four shorter than any of the others. 



Maxillipeds. — Inner plates not much longer than broad, not reaching the apex of the 

 first joint of the palp, with two long plumose spines or setae on the inner margin, and 

 the broad slightly dentate distal margin crowded with serrate spines and spine-teeth ; 

 the outer plates reaching a little beyond the middle of the second joint of the palp, 

 crescent-shaped, the concave serrate inner margin fringed with numerous sharp spines of 

 increasing length towards the apex, the seven wdiich pass round the apex and a little 

 way down the outer margin assuming the character of plumose setae ; the first joint of 

 the palp short, the second long and large, dilating greatly from the base distally, fringed 

 with spines or setae round the inner margin and carrying some on the surface ; the third 

 joint a little longer than the first, narrow at the base, with numerous spines on the outer 

 margin, surface and apex, most of them pectinate ; the finger short with the dorsal cilium 

 near the base, and a cilium inserted where the inner margin is prolonged at the base of 



