IMlMONECTES, A REMARKABLE GENUS OF AmPHIPODA HyPERIDEA. 13 



The ßrst pair of antennce are longer than the head, not serrated. 



All the pereional segments are inflated. 



The thwd pair of pereiopoda are only a little longer than one 

 eighth of the diameter of the globe. 



The first pair of uropoda reach far beyond the end of the se- 

 cond pair. 



Here the globe is most developed, much larger than in both the 

 preceding species. Also the proportion between the body and the legs is 

 another. The circular space at the ventral side of the body is limited 

 by the head, all the pereional segments, and the first of the pleonal seg- 

 ments, which however does not participate in forming the globe. The 

 pleon and urus together equal a fifth of the diameter of the globe. 



The head is three times as high as long, but as broad as high. 

 It is broader below than upwards. 



The eyes are six to eight on each side. 



The upper antennce are broad and stout, thick at the base, tapering 

 towards the end, consisting of a two-jointed peduncle; the basal joint is 

 very thick and broad, the second joint larger than in M. Lovéni. The first 

 joint of the flagellum is broad at the base, tapering towards the end; it 

 carries, on the inner side, at the under-margin, two rows of long olfac- 

 tory (?) hairs; each hair is fixed on a little button or round disk. The 

 upper margin of the joint is quite, even. After the long basal joint of 

 the flagellum follow three short slender joints, the second the longest; 

 all without teeth. The last one carries two long hairs, the preceding- 

 one hair each. Beneath the base of the upper antennae there is on 

 each side a rounded protuberance, at the summit of which there is a hole 

 protected b}^ a thin membrane. 



Behind these protuberances the loicer antennce are fixed. They are 

 four-jointed, like those of M. Lovéni. They equal a third of the length 

 of the upper antennœ. 



The j^ereion. The first segment is half as long and half as high 

 as the second, which is the longest of all, and six times longer at the 

 dorsal curvature than at the ventral side. The summit of the globe is 

 formed of the third segment, which is a little more than half as long 

 as the second. The third segment is a fourth higher than the fifth, 

 more than twice higher than the sixth, and more than five times higher 

 than the seventh. The second to sixth segments carr}' branchial sacks 

 and ovitectrices. The first to sixth segments show small but distinct 



