COPEPODS OF THE WOODS HOLE REGION 533 



3-segmented, the middle segment only half as wide as the other two, 

 the end segment swollen at the base, with a pair of knobs on its dorsal 

 surface, and a long dactylose posterior process. Each abdominal seg- 

 ment has a pair of lateral and a pair of ventral processes. Ovisacs 

 attached to the oviduct openings by the center of one side, and ex- 

 tending both forward and backward along the sides of the body in- 

 side the curved processes, which hold them in place and protect them. 

 Total length of five Woods Hole specimens: 14.5-18-18-22-27 mm. 

 Width of second and third thoracic segments, 6-8 mm. 



Male. — Head about as wide as long with smooth margins; second 

 thoracic segment armed with a stout curved spine at each posterolat- 

 eral angle. Genital segment a little longer but no wider than the 

 fifth segment. Each caudal ramus five times as long as wide and 

 tipped with two setae of equal length. Two pairs of biramose swim- 

 ming legs, the exopod 2-segmented, the endopod 1-segmented, both 

 rami well armed with spines and setae. Total length, 4-5 mm. 



Remofrks. — If more swordfish were examined for these parasites, 

 they would probably be found in considerable abundance; they are 

 easily recognized. 



