NO. 2 HARTMAN, BARNARD: BENTHIC FAUNA OF DEEP BASINS 141 



5. First few segments greatly prolonged (Plate 15, rig. 1 ) 

 Lumbriclymene Uncus 



5. First few segments not greatly prolonged .... 

 Lumbriclymene spp. 



6. Anal pore dorsal to anal plaque 9 



6. Anal pore within anal plaque 7 



7. Cephalic plaque not sharply set off from body region and visible 

 as a dorsal transverse ridge behind prostomial region 

 Rhodine bitorquata 



7. Cephalic plaque distinctly set off from body region . 8 



8. Anal plaque prolonged posteriorly as a cone ... 14 



8. Anal plaque not prolonged posteriorly .... 13 



9. Cephalic plaque with a longitudinal median nuchal ridge 10 

 9. Cephalic plaque without or with a very short nuchal ridge 



or smooth 12 



10. Cephalic and anal plaques with entire margins . . 11 



10. Ventral edge of anal plaque with crenulations 

 Maid 'an e glebifex 



1 1 . Anterior segments with melanistic pigment pattern 



Maldane sarsi 



1 1 . Anterior segments pale, without pigment pattern 

 Maldane sarsi, pallid 



12. Anal and cephalic plaques with crenulated margins 

 Asychis lacera 



12. Anal plaque otherwise Asychis spp. 



13. Neuropodial spines of first 3 segments nearly straight; anal 

 plaque with 18 filaments alternating long and short and a 

 longest, midventral one . . . Euclymene delineata 



1 3. Neuropodial spines of first 3 segments distally crooked ; anal 

 plaque otherwise Euclymene spp. 



14. Anal flange with 3 long cirri (Plate 15, fig. 3) 

 Praxillella trifila 



14. Anal flange with a circlet of many cirri .... 15 



15. Anterior end of prostomium prolonged forward as a slender 

 palpode Praxillella gracilis 



15. Prostomium not prolonged forward as a palpode 



Praxillella sp. 



