EXPLANATION OF PLATE XII. 



IHcfijaulvs elegans. F. E. Sch. 



Fig. 1. Upper part of a specimen. Nat. size. 



Fig. 2. Arrangement of the spicules in a transverse section of the body- 

 wall, vertical to the surface. x 50 (combined figure). 



Fig. 3. Dermal floricom. x ;100. 



Fig. 4. A single branch-ray of a dermal floricom. x 300. 



Fig. 5. Central part of a dermal floricom. x 1200. 



Fig. 6. Parenchymal floricom. x liOO. 



Fig. 7. A single branch-ray of a parenchymal floricom, in lateral view. 

 X 1200. 



Fig. 8. Small, parenchymal discohexaster. x 300. 



Fig. 9. Surface view of a terminal disc of a parenchymal discohexaster. 

 X 1200. 



Fig. 10. Large, parenchymal discohexaster. x 300. 



Figs. 11 and 12. Distal part of a branch-ray of a large discohexaster. 

 X 300. 



Fig. 13. Parenchymal codonhexaster. x 300. 



Fig. 14. Branch-ray of a parenchymal codonhexaster. % 1200. 



Fig. 15. Central part of a codonhexaster, with one branch-ray. x 1200. 



Fig. 16. Parenchymal drepanocom with recurved branch-ray terminations. 

 X 300. 



Fig. 17. Lateral view of a single branch-ray of the drepanocom repre- 

 sented in fig. 16. X 1200. 



Fig. 18. Drepanocom with erect branch-ray terminations. x 300. 

 Fig. 19. Lateral view of a single branch-ray of the drepanocom repre- 

 sented in fig. 18. x 1200. 



Fig. 20. Fragment of a small codonhexaster. x 1200. 



Fisr. 21. Small codonhexaster. x 400. 



Fig. 22. Parenchymal spined oxyhexactine. x 150. 



