EXPLANATION OF PLATE V. 



Hyalouenui masoiii. F. E. Sch. 



Fig. 1. A specimen. Nat. size. 



Fig. 2. Arrangement of tlie spicules in a section tlirough the margin of 

 the calyx, vertical to the surface. x 60 (combined figure). 



Fig. 3. Arrangement of the spicules in a section vertical to the surface. 

 X 200 (combined figure). 



Fig. 4. Pinule-like marginal spicule. x 200. 



Figs, 5 and 6. Parenchymal micro-oxyhexactines. x 400. 



Fig. 7. Mesamphidisc. x oOO. 



Figs. 8 and 9. Micramphidiscs. x 800. 



Fig. 10. Dermal macramphidisc. x 300. 



Fig. 11. Parenchymal micro-oxyhexactine. x 300. 



