22 BRITISH COPEPODA. 
largely developed (fig: 6). The first foot-jaw (fig. 
' 7) is strong, having a long apical claw and three setif- 
erous marginal segments; second foot-jaw (fig. 8) 
slender, the hand somewhat angulated on the outer 
margin and bearing a long terminal claw. First pair 
of feet (fig. 9) elongated, both branches of equal 
length; outer branch terminating in four claws and 
bearing a short spine in the middle of the outer 
margin ; first joint of the inner branch very long, ex- 
panded towards the base, ciliated along the outer, and 
having a small plumose seta attached to the middle of 
the inner margin ; last two joints very small and termi- 
nating in two or three curved sete. The joints of the 
three following pairs of feet are angular, dilated 
towards the apices, and ciliated on the outer border, 
while the common basal segment bears a comb-like 
series of six teeth on its inner angle (fig. ll a). The 
inner branch of the second pair in the male (fig. 10) 
has its second joint much narrowed and produced at 
the apex, forming an abortive third joint (fig. 10 5), 
which bears an apical spine and two long plumose 
lateral setze, while springing from its base on the 
outer side are three stout spines (fig. 10c), one of 
which is short, the other two long and sinuous. Fifth 
pair of feet, in the female, very large and foliaceous 
(fig. 12), the segments of nearly equal size; outer 
segment ovate; margins finely ciliated beyond the 
middle; apex obliquely truncate and emarginate, and 
fringed with seven short setz; mner segment some- 
what triangular, with rounded broad apex, which bears 
four short hairs and a row of minute cilia, also a short 
