PLATE XXXVI. 



PAGE 



Hyalonema depressum, F. E. S., . . .217 



Fig. 1. Vertical section of the lateral wall ; x 12. 

 Fig. 2. Parenchymal monact ; x 100. 

 Fig. 3. Great amphidisc with bent central prongs ; x 300. 

 Figs. 4, 5. Middle-sized amphidiscs ; x 300 and 450. 

 Fig. 6. Small amphidiscs ; x 450. 



Fig. 7. Middle part of a long spicule of the basal tuft ; x .50. 

 Fig. 8. Part of a hypodermal pentact ; x 100. 

 Fig. 9. Oxyhexact with straight barbed rays ; x 300. 

 Fig. 10. Oxyhexact with bent barbed rays ; x 300. 

 Fig. 11. Inferior end of an anclior-bke spicule of the basal tuft ; x 100. 



