1124 THE VOYAGE OF H.M.S. CHALLENGER. 



one of which is large and a little denticulate ; the inner ramus is similarly armed ; the 

 peduncles of the second pair as long as the inner ramus, with a spine at the apex of each 

 of the upper margins ; the outer ramus shorter than the inner, with a spine on each 

 margin and an apical group as in the preceding pair ; the inner ramus with three spines 

 on one margin, one on the other, and the apical group ; the peduncles of the third pair 

 lonoer than the rami, reaching much beyond the peduncles of the preceding pahs, having 

 four small spines and a couple of setas on the distal margin ; the rami very short, the 

 outer with a slender spine just below the middle of the outer margin and two short 

 hooked spines at the rounded apex, the outer spine the stouter ; the inner ramus oval, 

 slightly lunger than the outer, with a spine near the middle of the inner margin, and at 

 the apex two short spines and a long and a short slender spine. 



The Telson of about equal length and breadth, much rounded, not reaching nearly so 

 far as the peduncles of the third uropods, with a pair of setas or setiform spines on 

 the surface, one on either side the centre of the telson, another pair lower down but 

 some way above the distal margin, each of the latter pair being attended by a setule ; 

 there is also a cilium or setule at the upturned corner on each side of the distal 

 margin, and perhaps some small cilia elsewhere. 



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

 front of the head to the extremity of the uropods, three-twentieths of an inch. 



Locality. — Station 186, Flinders Passage, September 8, 1874; lat. 10° 30' S., long. 

 142° 18' E. ; depth, 8 fathoms; bottom, coral mud. One specimen. 



Remark. — The specific name refers to the place of capture. There is a great 

 similarity between this species and Amphithoe brevipes as figured and described by 

 Dana, but the two species do not seem to agree in respect to the uropods and telson. 

 Amphithoe brevipes was also taken in a very different climate, "near Hermite Island, 

 Tierra del Fuqgo ; brought up with kelp in 5 fathoms water." With Amphithoe 

 brevipes, Dana, Amphithoe falklandi, Spence Bate, seems to be in close agreement, 

 since in the description of the upper antennas of the latter species, " third joint of the 

 peduncle longer than the preceding," third is probably only a misprint for second. 



Amphithoe japonica, n. sp. (PI. CXXXVTII. A). 



In general appearance this species is in close agreement with Amphithoe rubricata, 

 Montagu. 



Rostrum obsolete, lateral lobes of the head not strongly advanced, the sides of the 

 head excavate below the lateral lobes for the base of the lower antennae ; the postero- 

 lateral angles of the first three pleon-segments with produced points, not upturned and 

 scarcely acute. 



