40 BRITISH COPEPODA. 



two or three being long and having their marginal 

 spines produced so as to form short branches. Man- 

 dibles (fig. 5) broad and strongly toothed; basal 

 joint of the palp large, and bearing two rather long, 

 biarticulate branches. Masticatory portion of the 

 maxilla (fig. 6) broad and strongly toothed ; palp well 

 developed. First two joints of the second foot-jaw 

 (fig. 8) finely ciliated along the upper margins; the 

 hand and nail both long and slender. First pair of 

 swimming-feet (fig. 9) robust and short ; inner branch 

 rather longer than the outer, its second joint longer 

 than the first ; outer and apical margins of the joints 

 fringed with large spines, those of the outer branch 

 being shortly plumose, while the longer setas are either 

 finely plumose or strongly pectinate. The other 

 swimming-feet have both branches 3-jointed and 

 nearly equal, the outer margins spinous and the larger 

 spines strongly pectinated (fig. 11). The inner branch 

 of the second foot in the male has the middle joint 

 produced into a large spine-like process (fig. 10), 

 first joint marginate with strong spines, last joint 

 long, slender, and bearing several long plumose seta3. 

 Basal joint of the fifth foot in the female (fig. 12) 

 broad and quadrate, with ciliated margins, and armed 

 along the distal border with five or six large thong- 

 like setse of various lengths ; outer joint much smaller, 

 similarly armed, but having only one large and several 

 small setae. The fifth foot in the male (fig. 13) is of 

 somewhat similar character, but much smaller; the 

 outer joint is large in proportion to the inner, and 

 the marginal spines are much fewer and smaller. 



