98 BRITISH COPEPODA. 
mandible-palp simple, 3-jointed. Maxilla-palp small, 
2-jointed. First pair of foot-jaws small, with a 
terminal claw and two or three marginal claw-like 
setze ; second pair forming a prehensile hand. Inner 
branch of the first pair of feet 2-joimted, non-pre- 
hensile, shorter than the outer branch ; inner branches 
of the second, third, and fourth pairs also short and 
2-jointed ; outer branches 3-jointed; fifth pair short 
and broad, 2-jointed. | 
This genus differs from Cletodes in having a 1- 
jointed secondary branch springing from the posterior 
antenne, and in the elongated 3-jointed mandible- 
palp. 
1. HNnuyprosoma curvatumM, Brady and _ Robertson, 
Pl. LXXXI, figs. 12—15 ; 
and Pl. LXXXII, figs. 
11—19. 
Rhizothriz curvata, B. & R. Brit. Assoc. Report, p. 197 (1875). 
The anterior antenne (figs. 13 and 14, Pl. LXXXIT) 
are short and stout, and beset with numerous setz, 
many of which are strongly plumose; the penultimate 
joint in the male forms a large vesiculiform swelling 
and the last joint is claw-like. The posterior antenna 
(fig. 14) has attached to its apex three stout, lancet- 
shaped setze,—one of which is strongly pectinate,—and 
four or five smaller lateral setze; the secondary branch 
bears two sete. The mandible (fig. 15) is bluntly 
