EXPLANATION OF PLATE VI. 



Figs. 1-8. Hi/aloneriKi (iln>rl-i. F. E. Sch. 



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



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

 X 60 (combined figm-e). 



Fig. 3. Dermal macramphidisc. x 300. 



Fig. 4. Micram phidisc . x 400. 



Figs. 4rt and 4A. Paradises, x 000. 



Fig. 5. Mesamphidisc. x 400. 



Fig. 6. Parenchymal micro-oxyhexactine. x 5)1). 



Fig. 7. Dermal pinule. x 300. 



Fig. 8. Marginal spicule. x 300. 



Figs. 9-17. Hyalouema investigatorix. F. E. Sch. 



Fig. 0. The only known specimen, which is strongly compressed. Nat. 

 vsize. 



Fig. 10. Arrangement of the spicules in a section vertical to the surface. 

 X 4U (combined figure). 



Fia:. 11. Paradise Avitli non-serrated terminal discs. x 1000. 



Fiff. 12. Paradise with serrated terminal discs, x 1000. 



Fig. 13. Terminal disc of a paradise seen from within. x 1200. 



Fig. 14. Terminal disc of a paradise seen from without, x 1200. 



Figs. 15-16. Paradises. x 100. 



Fig. 17. Dermal pinule. x 100. 



