REPORT ON THE AMPHIPODA. 997 



line which forms an angle with the convex lateral margin, while on the other side the 

 lohe is rounded. 



Mandibles in general like those of Pardalisca abyssi, but on the right mandible the 

 upper semi-divided tooth is apically rounded, the other three being acute ; there are two 

 adjacent denticulate spines, one rather broader, the other rather longer, than its com- 

 panion, both much longer in the new growth than the pair in actual use ; the first joint 

 of the palp is not twice as long as broad ; the second joint is short, though longer than 

 either the first or third, having on the convex inner margin and adjacent surface four 

 short and four long pectinate spines ; the oval third joint with a flattened apex, is armed 

 with some eighteen or twenty pectinate spines. 



Lower Lip as in Pardalisca abyssi, but seemingly less strongly ciliated. 



First Maxillae. — Inner plate not clearly observed ; the outer plate with a widened 

 distal margin carrying nine spines, the innermost long, plumose, setiform, the others with 

 a single lateral tooth at or below the middle of the inner margin, the two outermost 

 being the thinnest and shortest ; on the surface near the outer corner there is a tenth 

 submarginal spine, small, shaped like the majority ; the first joint of the palp is but 

 little longer than broad, the second from a narrow base expands rapidly, and the broad 

 rounded distal portion is crenate, with fifteen little spine-teeth and slender spines in the 

 interstices. 



Second Maxillse.— The inner plate broader but not quite so long as the outer, with 

 seven long plumose setae on the distal part of the inner margin and the oblique apex ; the 

 outer plate with three on its truncate apex. 



Maxillipeds. — The inner plates scarcely distinct from the short joint which carries 

 them, the distal margin forming an almost continuous slope, the part belonging to the 

 plate, however, being flat and carrying two setse, one moderately long, the inner very 

 short ; the second joint long, with a fringing on both margins of sctules intermixed with 

 spines, the plate much more than a third of the total length, reaching a good way beyond 

 the first joint of the palp, its distal margin sloping outwards, having three setules on the 

 outermost part, and a dozen spines of no great stoutness on the remainder ; the first 

 joint of the palp short, the second not very much longer, with some setules on the outer 

 margin, three setse on the inner, and two or three long ones at the apex ; the third joint 

 about as long as the first, narrowly oval, with spines along the outer margin and at the 

 apex of the inner ; the finger short and broad, with four curved spinules along the side, 

 and a sharp narrow nail. 



First Gnathopods.—Side--pMes nearly square, but deeper than broad, not wider above 

 than below, lower margin only slightly fringed. The first joint reaching much below 

 the side-plate, of great breadth, about twice as long as broad, the front margin nearly 

 straight, fringed with spines, of which there are several also along the surface, the very 

 convex hind margin seeming to be free from them except at the apex ; the second joint 



