J BRITISH COPEPODA. 
isa hinge between the fifth and sixth. Inner branch of 
the posterior antenne (fig. 3) 3-jointed ; mandible- 
palp (fig. 4) large and strongly setose ; maxille (fig. 5) 
strong, with a well-developed palp; anterior foot-jaw 
(fig. 6) 4-digitate ; posterior with a slenderly ovate 
hand, which has a long plumose seta on the inner and 
three short ones on the outer margin (fig. 7). Inner 
branch of the first foot about twice as long as the outer ; 
first joint very long, second scarcely as long as broad, 
third about twice as long as the second, and bearing 
two slender, shghtly curved, terminal claws; the first 
joint has a strong apical seta, and 1s ciliated along the 
inner margin ; the second joint of the outer branch is 
rather larger than the first and about twice as long as 
the third; the margins of all the joints of the outer 
branch bear long apical spines and pectinate rows of 
stout seta (fig. 8). The second, third, and fourth 
pairs have the joints more or less angulated at the 
distal extremities (fig. 10), and those of the outer 
branches are strongly spined; the terminal joints 
considerably longer than the others. The second pair 
in the male is only 2-jointed, the last joint (fig. 9) 
being reduced to a broad, lancet-shaped spine (fig. 9 a) 
and a digitiform segment, which bears three sete. 
The fifth pair in the female (fig. 11) has a broad basal 
joint, produced internally, with ciliated margins and 
five long setz; the outer joint is broadly ovate, 
ciliated internally, and bearing six large marginal sete. 
In the male both lobes are much smaller, and the 
inner one (fig. 12) has only two terminal sete. The 
caudal segments (fig. 13) are very short, the setz of 
