SURFACE COPEPODA OF THE GULF OF MANNAB. 249 



(J. The grasping antenna consists of sixteen joints, having 

 the following proportional lengths : — 



Segments : 



Segments : 



The fifth pair of legs correspond exactly with the description 

 and figures given by Cleve {loc. cit., 1901). 



ToRTANUs FOKCiPATUS (Giesbrecht), 



(PI. XXL, fig. 6.) 



Tortanus forcipatus, Thompson & Scott, 1903, ]), 254. 



This species was first described by Giesbrecht from female 

 examples only. In the present collection numerous examples 

 were found, and associated with them were several examples 

 of a hitherto undescribed male, w^hich I have no doubt is the 

 unknowTi male of this species. 



c?. Total length. 

 Proportional lengths of cephalothorax and abdomen, 5 : 3. 

 The head and all the thoracic segments are separate. The 

 abdomen consists of five segments having, with the farcal rami, 

 the following proportional lengths : — 14 : 15 : 12 : 9 : 13 : 70. 

 In T. gracilis the corresponding proportional lengths are : 

 14 : 14 : 11 : 8 : 15 : 72. The f ureal rami are symmetrical ; 

 four f ureal setse arise from the distal end of the ramus, and of 

 these the second is the longest. The fifth seta is quite short, 

 and arises from the lateral border. 



The grasping antenna consists of sixteen joints, having the 

 following proportional lengths : — 



Segments : 1-5. 6. 7. 8. 9-10. 11. 12. 13, 



114 13 20 20 26-29 23 23 43 



Segments : 14. 15. IG. 17. 18, 19-21. 22-25 



62 59 62 75 98 150 183 



