REPORT ON THE AMPHIPODA. 1365 



indeed represented in the male, but standing at a greater distance from the postero- 

 lateral angle and being very faintly marked ; in the female there is very little convexity 

 in either the upper or lower margin of these segments. 



Upper Antennae two-jointed, the first joint rather thicker than the second, but not 

 half as long, the second joint widening a little for some distance, then narrowing and 

 carrying three or four pairs of filaments, the apex blunt or truncate. 



Lower Antennae only represented by the semicircular rudiment swelbng out on each 

 side of the head just below the lateral eye ; from the lower part there is a little projection 

 containing the opening of the gland-cone. 



MaxiUipeds. — The inner plate rudimentary ; the sinuous inner margin of the outer 

 plates carries five conspicuous spaced denticles, followed by two smaller close together, 

 and these again by a finely pectinate tract, while the narrowed apical portion is almost 

 smooth, the blunt end having a setule ; there are also two setules on the surface below 

 the apex. 



Gnathopods differing little from those of the male. 



Peraeopods more elongate than in the male ; in the first and second perseopods the 

 length of the third joint is much greater as compared with the second joint ; the second 

 perseopods are much shorter than the first, the difference in size being very marked in 

 the fourth joint as well as in the fifth. 



TJiird Peraeopods. — First joint much longer than in the preceding pair, narrower 

 than in the male, with six teeth on the front margin, and three besides the apical teeth 

 on the hind margin ; the second joint with three little teeth or serratures ; the third 

 joint twice as long as the second, with five teeth on the front margin ; the fourth joint 

 more elongate and slender than in the male, the largest tooth of the front margin being 

 the seventh or eighth, below which are two strong teeth ; the fifth joint relatively 

 shorter than in the male. 



Fourth Peraeopods. — The fourth joint very much longer than the fifth, the front 

 margin seemingly smooth, except for a minute setule here and there. 



Fifth Perseopods. — Fourth joint much more than twice as long as the third and 

 considerably longer than the fifth. In this and the preceding pair the gland-cells are 

 very conspicuous in the long first joint. 



Pleopods. — Peduncles narrowly oval. 



Uropods. — Peduncles rather more slender and elongate than in the male ; the second 

 pair rudimentary, consisting of a single lanceolate joint so short that it only about 

 reaches to the base of the telson. 



Length rather greater than that of the male specimen. 



Locality. — February 6-7, 1875; south of Mindanao, Celebes Sea; lat. 6° 20' N., 

 long. 123° 18' E.; surface, night ; surface temperature, 81° 7. Six specimens, one male, 

 five female. 



