112 BRITISH COPEPODA. 



is a hinge between the fifth and sixth. Inner branch of 

 the posterior antennas (fig. 3) 3-jointed ; mandible- 

 palp (fig. 4) large and strongly setose ; maxillae (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, slightly curved, terminal claws ; the first 

 joint has a strong apical seta, and is 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 setas. 

 The fifth pair in the female (fig. 11) has a broad basal 

 joint, produced internally, with ciliated margins and 

 five long seta?; the outer joint is broadly ovate, 

 ciliated internally, and bearing six large marginal setae. 

 In the male both lobes are much smaller, and the 

 inner one (fig. 12) has only two terminal seta3. The 

 caudal segments (fig. 13) are very short, the setaa of 



