Amphipoda Synopidea. 29 



flagella are longer than the pedniieles. The fhigeUuii) of the Hrst pair 

 consists 17 joints. 



The urns [PL III, fig. 60] is shorter than the first two pereional 

 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 

 longer; both broadly lanceolate. 



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

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

 longer than the peduncle. 



The third j)air are nearly 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, ti.i,^ 61 — 67). 



The specimens examined were probably just out from the incuba- 

 tory pouch of the mother; they present some interesting differences, 

 which will be shortly mentioned below. Some of these characteristics 

 point decidedly to the family Synopidas. 



The head is longer than the first pereional segment. 



The e^es are distinctly faceted, but without the brown pigment. 



The first pair of antennw [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 antennce [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 maxilla? are but feebly developed, the laminae and the palp of 



