188 CAEL BOVALLIUS, AMPHIPODA HYPERIIDEA. I. 2. HYPEEIIDiE. 



liyperia galba. 



The first pair of antennce reach below the under margin of the head; the single 

 flagellar joint is narrowly lanceolate, and almost twice as long as the whole peduncle. 



The seconcl pair of antennce are longer than the first pair. The single flagellar joint 

 is like that of the first pair in form, and fully twice as long as the Avhole peduncle. 



The first and second jjairs of perceopoda are like those in the male. 



The third and fou7'th pairs (Pl. X, fig. 30) are somewhat stouter than in the male. 

 The femur is not fully three times as long as broad, as long as the genu and tibia and 

 half the carpus together, but scarcely broader than the tibia. The carpus is armed with one 

 single spine at the lower hind corner. The metacarpus is comparatively shorter than 

 in the male, and not twice as long as the tibia. The dactylus is a fourth part as long 

 as the metacarpus. 



The fifth, sixth and seventh ijairs (Pl. X, fig. 31) are longer than the two preceding 

 pairs. The femur is scarcely twice as long as broad, nearly twice as broad as the femur 

 in the third and fourth pairs, and considerably longer than the two following joints to- 

 gether. The carpus is longer than the tibia in the fifth pair, and quite as long as 

 the tibia in the sixth and seventh pairs. The metacarpus is as long as that of the 

 two preceding pairs, but comparatively shorter than that in the male, and not twice as 

 long as the tibia. The dactylus is a fourth as long as the metacarpus. 



The uropoda (Pl. X, fig. 32) are somewhat stouter and comparatively shorter than 

 in the male. The peduncle of the first pair is fully four times as long as broad; the 

 rami are narrowly elongate, equal in length, and only a fourth part shorter than the 

 peduncle. The peduncle of the second pair is fully twice as long as broad, considerably 

 longer than the inner ramus, and much broader than the peduncle of the first pair; the 

 iimer ramus is broadly ovate, sharp-pointed, serrated on both margins, and broader and 

 longer than the outer ramus. The peduncle of the third pair is not fully twice as long 

 as the last ural segment, and raore than twice as long as broad; the rami are about 

 equal in length, and much longer than the breadth of the peduncle; the inner ramus is 

 nearly twice as long as the outer, broadly ovate, sharp-pointed, and has both the marg- 

 ins serrated; the outer ramus is serrated along the inner margin and smooth on the outer. 



