Marine Copepoda 



25 k 



outer branches of the fourth legs were 3-jointed and equal., .'Anterior antennae 

 with five joints; in the figure of the antenna most of the setae are omitted; on 

 the terminal joint one of the setee has a swollen base (Fig. 29). ^^ 



Fig. 29. Ectinosoma negledum 9 juv. 

 Front and anterior antenna. 



The anterior lip (labrum) projects in front of the mouth-parts as an acute 

 recurved hook in both sexes. Two males, from station 40e, measured 0-77 and 

 0-86 mm. respectively. On the ventral side, the posterior borders of the ab- 

 dominal segments are fringed with delicate spinules, including the pre-anal and 

 anal segments, on which the spinules are smaller. On the dorsal aspect, the 

 posterior borders of Ab 1, Ab 2, Ab 3, and Ab 4 are conspicuously fringed. 

 The urosome of the male consists of six segments: Th 5 and Ab 1-5. 



The anterior antennae of the male (Fig. 30) are thick and short, with a 

 double protuberance at the back of the third joint. This protuberance is shown 

 as a single tubercle in the figure by Sars. 



Fig. 30. Ectinosoma negledum. 

 Anterior antenna of male, from below. 



The posterior antennae resemble those of E. sarsi; the Re is 3-jointed with 

 the following relative lengths of the joints: 6, 4, 11; Re 1 carries a distal seta. 

 Re 2 a stronger and longer seta. Re 3 a short setula and two terminal plumose 

 setae, one longer than the other. The mandibular palp likewise resembles that 

 of E. sarsi: a long B2, with a distal group of three setae, carries a terminal 

 one-jointed Re and, at a distance from the latter, a shorter tri-setose Ri. 



