WESTWOODIA. 141 
1. Westwoopia NosiLis, Baird. Pl. LXIII, figs 1—198. 
Arpacticus nobilis, Baird. Trans. Berw. Nat. Club, ui, p. 165, 
1845; Ann. and Mag. Nat. Hist. xvii, p. 416, 
t. 9, figs. 5, 5 a, b, c, d (1846); Brit. Entomo- 
straca, p. 214, tab. 28, figs. 2, 2 a—e (1850). 
Westwoodia nobilis, Claus. Die frei-lebenden Copepoden, p. 118, 
t. 21, figs. 1—9 (1863). 
— — Boeck. Oversigt Norges Copep., p. 35 (1864). 
Anterior antenne short, in the male 6-jointed (fig. 3), 
in the female 7-jointed, rather stout (fig. 2), third joint 
much the longest, toothed on its upper edge, last 
four nearly equal, and altogether scarcely as long 
as the preceding joint ; all the joints setiferous. Inner 
branch of the posterior antenna (fig. 4) rather large, 
2-jointed. Hand of the second foot-jaw (fig. 8) oblong- 
ovate, having a long spine-like seta near the middle of 
the inner margin; terminal claw long and slender. 
The outer branch of the first pair of feet (fig. 9) con- 
sists of one joint, which is large, ovate, and bears several 
marginal spines and sete; the inner branch is 3- 
jointed, the first joint being much elongated and 
haying a very long plumose seta near the middle of its 
inner margin; terminal claw long and slender. The 
inner branches of the three following pairs of swimming- 
feet are much shorter than the outer, the first two 
joints in both branches, but especially in the inner, 
being unusually broadand angular. The inner branch 
of the second pair in the male is only 2-jointed and 
has modified spines. Fifth pair of feet of moderate 
size and not very different in the two sexes, the mar- 
