REPORT ON THE AMPHIPODA. 893 



end, then running out into a point ; the wrist subequal in length to the hand, widening 

 a little distally, with some setaa on the hind margin and its apex ; the hand long and 

 almost parallel-sided, the straight hind margin being fringed for almost its whole 

 length with pairs or larger groups of long setse ; there are some short setae near 

 the apex of the front margin ; the thumb and finger seem to resemble those of the 

 first gnathopods. 



First Perxopods. — Side-plates like the preceding pair, but longer. The third joint 

 of the limb apically decurrent in a short sharp point. 



Second Perxopods. — The side-plates with very convex front margin, serrate below, 

 the hind margin concave, forming two large curves separated by a sharp process, the lower 

 curve the longer, serrate near the acute apex. The third joint of the limb as in the pre- 

 ceding pair. 



Third Perieop>ods. — The side-plates bilobed, the hinder lobe having a very acute 

 backward-directed process. The first joint of the limb has the hind margin very sinuous 

 and strongly serrate, forming with the serrate lower margin a sharp backward-directed 

 apical tooth ; the second joint is very small ; the third is longer than the fourth, being 

 behind decurrent in a long apical tooth ; the fifth joint is longer than the fourth, and 

 like both the third and fourth has small spines along both margins ; the finger is a little 

 curved, longer thau half the fifth joint. 



Fourth Perwopods similar to the third, but larger. 



Fifth Perseopods. — The side-plates have a backward-directed process as in the two 

 preceding pairs. The sinuous hind margin of the first joint is produced downwards in a 

 sharp tooth at an angle with the lower margin, in other respects the limb seems to 

 resemble the two preceding pairs, but exceeds them in size. 



Urojwds. — The peduncles of the first pair longer than the rami, the margins and apices 

 carrying rather large spines; the rami long and slender, nearly equal, the outer slightly the 

 shorter, the apical portion in each narrowed so as to look like a nail, yet with no sign of 

 jointing or suture ; both rami having marginal spines and pectinate edges ; the peduncles 

 and rami of the second pair not reaching so far back as those of the first and third pairs, 

 the peduncles longer than the outer, shorter than the inner ramus, the rami armed like 

 those of the first pair ; the peduncles of the third pair much shorter than the ramus, with 

 three acute distal prolongations, two of which are rather long ; one of the rami missing, 

 the other long, tapering, with marginal spines and pectinate edges. 



Telson concave above, almost oblong, longer than broad, the lateral margins scarcely 

 converging, apically produced to a sharp tooth on either side of the truncate distal 

 border, in the centre of which there is a very small emargination. 



Length. — The specimen, in the position figured, measured, in a straight line from the 

 rostrum to the back of the third pleon-segment, about three-tenths of an inch. 



Localities.— Station 150, off Heard Island, February 2, 1874; lat. 52° 4' S., long. 



