EUTERPE. 23 



very small and armed with a long, curved, apical claw, 

 the whole forming a powerful prehensile organ. The 

 posterior antennae are 3-jointed and rather large, the 

 basal joint giving attachment to an accessory branch 

 composed of a single joint, which is smaller in the 

 female than in the male (fig. 4) ; in the latter sex it is 

 armed at the apex with a falciform claw, which, accord- 

 ing to Glaus, is used as an auxiliary clasping organ. 

 The mandibles (fig. 5) are short and stout, strongly 

 toothed, and bearing a short 2-branched palp. The 

 maxillae (fig. 6) are strongly toothed, and have a 2- 

 jointed clawed palp. The upper foot- jaw (fig. 7) bears 

 three marginal digits, which, as well as the terminal 

 segment, are provided with plumose setae ; the lower 

 (fig. 8) is exceedingly long and slender, 3-jointed, with 

 a very long curved claw at the apex. The swimming- 

 feet of the first pair are 2-branched, each branch con- 

 sisting only of two joints ; and in the male (fig. 9) the 

 inner branch is sharply flexed, the terminal joints of 

 both branches bear ou the inner margin and at the 

 apex five long, finely-plumose setae, but neither of 

 them possesses a prehensile claw. The three follow- 

 ing pairs of feet have both branches 3-jointed, the 

 inner branch, however, being in each case much 

 shorter than the outer (figs. 10, 11, 12) ; all the setae 

 of these limbs are plumose, but those belonging to the 

 first joint much more strongly so than the rest. The 

 fifth foot in the female is foliaceous, elongated, subovate 

 (fig. 13), bearing at the broad apex five spines, of which 

 the three median ones are plumose ; on the middle of 

 the external margin there is also a spine of nearly 



