EXPLANATION OJ^^ PLATE IV. 

 Figs. 1-14. HijaJonema indieum andaw.anense. F. B. Sch. 



Fig. 1. The only known, considerably oompressed specimen. Nat. size. 



Fig. 2. Arrangement of the spicules in a section vertical to the surface. 

 X 60 (combined figure). 



Figs. 8 and 4. Dermal macramphidisc. x 400. 



Fig. 5. Mesamphidisc. x 400. 



Figs. 6-9. Micramphidiscs of different sizes. x 400. 



Figs. 10 and 11. Micro-oxystauractines. x 600. 



Fig. 12. Micro-oxyhexactine. x 600. 



Fig. 13. Pinule of the oscular sieve-plate. x 300. 



Fig. 14. Pinule of the outer skin. x 300. 



Figs. 1 5-24. Hyalonema welfimri. F. E. Sch. 



Fig. 1-5. The only known specimen. Nat. size. 



Fig. 16. Arrangement of the spicules in a section vertical to the surface. 

 X 60 (combined figure). 



Fig. 17. Dermal macramphidisc. x 230. 



Fig. 18. Mesamphidisc. x 300. 



Figs, 1 19 and 20. Micramphidiscs. x 300. 



Fig. 21. Lower end of an anchor-spicule of the canal root-tuft. x 200. 



Fig. 22. Parenchymal micro-oxyhexactine. x 300. 



Fig. 23. Spined, parenchymal micro-oxyhexactine. x 300. 



Fig. 24. Dermal pinule. x 300. 



