WALKER—AMPHIPODA GAMMARIDEA. 300 
18. Chagosia gardineri, sp.n. (Plate 42. fig. 3.) 
I. Between Peros and Salomon Atoll, dredged from 600 fms. One female. 
Head produced as a short hood covering the base of the antenne. Eyes 
rudimentary. 
Antenna 1: Ist joint longer than 2nd and 38rd united, widening distally and produced 
below in a truncate setiferous tooth; 2nd and 3rd joints subequal, and produced below 
like the Ist; the 3rd subequal to the 1st joint of the flagellum, which has 30 joints and 
is about 4 times as long as the peduncle. Accessory flagellum shorter than the Ist joint 
of the flagellum, 1-jointed, truncate. 
Antenna 2: Ist joint short, produced above; 2ndand 8rd subequal, the 2nd extending 
beyond the end of the peduncle of ant. 1; flagellum tapering, extremely slender towards 
the end, about 4 times as long as the peduncle. 
Mouth-organs not examined. 
Maxillipeds large and prominent; outer plates large, reaching beyond the end of the 
wide 2nd joint of the palp; 4th joint (nail) almost as long as the 8rd, acute, serrate. 
Gnathopods 1 and 2 apparently spring from the base of the maxillipeds; the joints 
narrow, wrist longer than, and produced beneath almost to the middle of the hand, of 
which the margins are subparallel; palm obliquely transverse, spinulose: the front 
margin extends beyond the base of the dactylus ; this-is longer than the palm and 
serrate, Side plate of 1 much expanded below, with intra-marginal sete; that of 2 
narrowed and rounded below (fig. 3, gz.) & gn.?). 
Perzeopods 1 and 2: second joints narrow, 4th, 5th, and 6th increasing in length 
successively, with a few scabrous spines and plumose sete. Dactyli nearly half as long 
as the 6th joints, with 3 pairs of divergent spines on the concave margin. 
Perezopods 3-5: second joints oblong, that of 5th widest; hind margins smooth, 
rounded below. 
Uropods 1 and 2: rami lanceolate, longer than peduncles, the outer the shorter; both 
edged with very small submarginal spines; the 1st pair extending beyond the 2nd and 
almost to the end of the 3rd (fig. 3, wr.). 
Uropod 3: ramus lanceolate and acute, 4 times as long as the peduncle, with small 
submarginal spines and a few longer ones on the inner margin (fig. 3, wr.). 
Telson reaching much beyond the end of the peduncle of uropod 38, deeply emarginate 
(fig. 3, w7.). 
Genus EUSIROIDES, Stebbing, 1888. 
19. Husiroides diplonyx, sp.n. (Plate 438. fig. 4.) 
I. Coetivy. Three. 
Differs from 2. monoculoides (Haswell) as follows :— 
Pleon segments have no dorsal teeth ; the 3rd has the hind and lower margins slightly 
convex, the hind with 3 small teeth above the subrectangular posterior angle. 
Pereopods 1 and 2 have a rather long curved spine at the base of and parallel to the 
dactylus (fig. 4, pp.”): hence the specific name. 
