Amphipoda Synopidea. 29 



tlag(>lla are longer thau the peduncles. The flagellum of the iirst pair 

 consists 17 joints. 



The unis [PI. Ill, iig. 60] is shorter than tiie first two pereit)nal 

 segments, and also shorter than the first two pleonal segments. At the 

 dorsal side of the first segments there is a deep excavation for the re- 

 ception of the hinder margin of the last pleonal segment, when the 

 body is stretched out. The second and third segments are free, not coa- 

 lesced, the third longer than the second. 



The first pair of uropoda reach to the ends of the peduncles of 

 the last pair; the rami are longer than the peduncle; the outer ramus is 

 slightly serrated along the outer margin; the inner ramus smooth, a little 

 lonyer; both broadlv lanceolate. 



The second pair reach as far as the third pair; the rami are nar- 

 rower and more pointed than in the preceding pair, smooth, a little 

 longer than the peduncle. 



The third pair are nearl}' as long as the two last ural segments, 

 the rami are more than twice longer than the peduncle, lanceolate, 

 smooth. 



The telson is almost circular, longer than the peduncle of the last 

 pair, with the margins smooth. 



Length 22 m.m. 



The young male. 



(PI. Ill, tisr- 61—67). 



The specimens examined were probably just out from the incuba- 

 tory pouch of the mother; they present some interesting diff'erences, 

 which will be shortly mentioned below. Some of these characteristics 

 point decidedly to the family Sjmopidge. 



The head is longer than the first pereional segment. 



The eyes are distinctly faceted, but without the brown pigment. 



The first pair of antennœ [PI. Ill, fig. 62] are nearly twice as long 

 as the head, the flagellum four-jointed, the secondary flagellum two-jointed. 



The second pair of antennœ [PI. Ill, fig. 63] have only fourjoints 

 in the flagellum, the first joint very long. 



The mouth-organs are very similar to those of the adult animal, 

 but the palp of the mandibles wants hairs, and the teeth at the ends 

 of the maxillai are but feebly developed, the laminte and the palp of 



