REPORT ON THE AMPHIPODA. 1023 



of setae) on the hinder ; the finger short, similar to that of the first peraeopods, but 

 broader and more curved. 



Fifth Penvopods. — The first joint differing from that of the preceding pair in being 

 much larger, the hinder expansion being extended considerably above and below the 

 front part of the joint ; the second joint entirely overlapped behind by the first ; the 

 rest of the limb similar in structure to that of the fourth peraeopods, but still more 

 massive, the third and fourth joints much, and the fifth a little, longer; the margins 

 strongly serrate ; the third joint with spines at four points of the hind margin, and a 

 large group of spines and setae at its apex ; on the front margin a small spine at one 

 point, followed by four large mixed groups ; the fourth joint, almost as long as the fifth, 

 is surrounded by great groups of spines and long stiffly outstanding setae ; the fifth joint 

 has many more groups of a similar kind ; this joint, as shown in the figure prp.b, has a 

 capacity for twisting into a direction the opposite of its normal position, without becoming 

 detached. 



Pleopods. — Coupling spines small ; a long spine inserted on the peduncle above them, 

 and many plumose setae on the sides of the peduncle ; cleft spines four to six in number, 

 with short, nearly equal arms, set some way from the base of the long first joint ; joints 

 of the inner ramus seventeen, the last very short. 



Uropods. — Peduncles of the first pair a little longer than the rami ; the outer ramus 

 rather shorter than the inner, both with blunt ends and groups of strong apical spines, 

 the inner branch with five along one of its edges, the outer with three on one edge, four 

 on the other ; the peduncles of the second pair broad, scarcely so long as the broad inner 

 ramus ; the outer ramus a little shorter than the inner, both with blunt ends and groups 

 of strong apical spines, also closely spined along the margins ; peduncles of the third pair 

 shorter than the very broad rami, of which the outer is a little longer than the inner, 

 which has three groups or rows of spines on the inner, and one on the outer, margin, while 

 the outer ramus has four rows on each margin, those on the outer margin the stronger, 

 each ramus having also a large row of spines along the broad, truncate, slightly emarginate, 



apex. 



Telson not so long as the peduncles of the third uropods, concave below, not quite 

 so long as broad, cleft nearly to the base, widely dehiscent, the convex outer margins 

 being apically produced in long points considerably beyond the acute apices on each side 

 of the cleft, the interval between each pair of apices being occupied by two long unequal 



spines. 



Length.— The specimen figured measured, in a straight line from the front of the head 

 to the end of the sixth person-segment, three-tenths of an inch, and as much more from 

 the end of the sixth segment of the peraeon to the extremity of the uropods. 



Locality.— Station 161, off Melbourne, April 1, 1874 ; depth, 33 fathoms; bottom, 

 sand. Two specimens. 



