70 BRITISH COPEPODA. 



and slender, the limb is much swollen at the hinge, and 

 again a little above, and is provided with denticulated 

 plates above and below the hinge joint; the setae are 

 but few except for a dense tuft at the extremity of the 

 last joint. The rudimentary apical portion of the 

 lower foot jaw (fig. 8) is obscurely (3 ?) jointed, and 

 on its upper margin bears a corrugated segment 

 sharply separated lengthwise from the lower portion of 

 the limb. Terminal spines of the swimming feet, 

 long, slender, and sword-shaped (fig. 13) ; the secon- 

 dary spine is much larger than usual, and both are 

 finely serrated on the inner edge. Fifth pair of feet 

 in the female (fig. 12) two branched; branches nearly 

 straight, cylindrical, and one- jointed ; the inner one 

 short and cloven at the apex, the outer twice as long, 

 bearing one short spine at the middle of the outer 

 margin, and one very long and two short at the distal 

 extremity. Fifth pair in the male (fig. 11) composed 

 of one branch on the left and two on the right side, 

 three-jointed ; those of the left foot broad and sub- 

 quadrate, the last joint spinous at the angles ; first 

 joint of the right foot narrow, and having a short one- 

 jointed branch which ends in a curved claw ; second 

 joint short and armed with a curved spine on the 

 inner margin ; third joint produced into a long slender 

 claw. Abdomen of the female (figs. 15, 16) three- 

 jointed ; the first segment short and stout, the second 

 smaller and produced downwards as far as the middle 

 of the dorsal surface of the third segment j produced 

 also into two small lateral spines. Caudal segments 

 as long as the last abdominal segment in the female, 



