106 



THE OPUIURIDJE OF THE MEROUI ARCHIPELAGO. 



and which has no upper arm-plates, being covered on the upper 

 arm with a minutely squamous skin, has very interesting arm- 

 bones ; they will be considered and described in the succeeding 

 pages. There is nothing to be added to the knowledge already 

 published regarding the common Ophiocoma scolopendrina ; but 

 I have added some notes concerning Ophiocnemis marmorata. 



DESCRIPTION OF THE PLATES. 

 Plate VIII. 



Fig. 1. Ophiolepis nodosa, sp. nov. Upper surface, nat. size. 



2. Part of the under surface of disk and arm, magnified. 



3. Upper arm in part, magnified. 



4. Ophiophragmus affinis, sp. nov. Upper view, magnified. 

 6. Part of disk below, magnified. 



6. Upper surface of arm and mouth-frame within disk, magnified. 



7. Ophiophragmus difficilis, sp. nov. Upper view, magnified. 



8. Arm and mouth -frames from above, magnified. 



9. Disk from below, magnified. 



10. Ophiocnida sexradia, sp. nov. From above. 



11. Part of under surface, magnified. 



Plate IX. 



12. Ophiothrix Andersoni, sp. nov. Upper view. 



13. Part of under surface, magnified. 



14. Ophiothrix merguiensis, sp. nov. Upper surface. 



15. Part of the under surface, magnified. 



10. Ophiothrix variegatus, sp. nov. Upper surface. 



17. Part of the lower surface, magnified. 



18. Ophiothrix variabilis, sp. nov. Upper surface. 



19. Part of the lower surface, magnified. 



20. Ophiocampsis pellicula, sp. nov. Upper surface. 



21. Under surface, magnified. 



Plate XI. 



(For description of the other figures (21-27) on this Plate, see p. 120.) 



28. Spine of Ophiothrix Andersoni, magnified. 



29. Hook, magnified. 



30. Disk-slumps, magnified. 



31. Spine of Ophiothrix merguiensis, magnified. 



32. Spine of Ophiothrix variabilis, magnified. 

 38. Section of spine, magnified. 



.'54. Small spine, magnified. 



35. Diflk-BtumpS, magnified. 



36. Hook, magnified. 



87. Spines of Ophiothrix Andersoni, magnified. 



38. Hook, magnified. 



39. Disk-stump, magnified. 



40. Spine of Ojihiocamvtit pellicula, magnified. 



