122 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 setae. 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. 11 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 b), 

 which bears an apical spine and two long plumose 

 lateral setae, while springing from its base on the 

 outer side are three stout spines (fig. 10 c), 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 setae ; inner segment some- 

 what triangular, with rounded broad apex, which bears 

 four short hairs and a row of minute cilia, also a short 



