Plate II. 



Fig. 10. — Portion of the umbrella of Microstylus setoucManus, showing the 



canal system and the radial muscle. 

 Fig. 11. — Perirhiza nematophora. | natural size. 

 Fig. 12. — Longitudinal section of Perirhiza nematophora. The left half 



represents a section through a perradial plane, and the right half 



that through an interradial. 

 Fig. 13. — Portion of the umbrella of Perirhiza nematophora, showing the 



canal system and the muscles. 



