PLATE XIX. 



Fig. 1. Scrupocellaria scabra v. Ben. 



Zooecia from the basal surface with pore-chambers. 

 Figs. 2, 3. Scrupocellaria ternata Ellis & Sol. var. gracilis Smitt. 

 Fig. 2. Zooecium in basal view with vibraculum and radical 



fibre. 



Isolated vibraculum. 



Membranipora fCallopora) craticiila Alder. 



Zooecia with large independent avicularia. 



Zooecia and avicularia with pore-chambers. 



Zooecia with ooecia and small avicularia placed on 



the top. 



Ooecium and zooecium with a small lateral avicularium. 



Membranipora (Callopora) spatulifera Smitt. 



Zooecia with spatulate spines seated proximally to the 



aperture. 



— 9. Ovate-pyriform zooecium with membraneous frontal 



area, lateral avicularia and an avicularium placed on 

 the top of the ooecium. 



— 10. Hexagonal zooecia with lateral avicularia and oral 



spines. 

 Figs. 11 — 14. Membranipora fCallopora) Whiteavesi Norman. 



Fig. 11. Pear-shaped ovate zooecium with ovate frontal area 

 and granular cryptocyst surrounded by a great number 

 of spines. 



— 12. Zooecium with spines of diflerent thickness. 



— 13. Zooecium with a calcareous plate in the aperture. This 



plate is perforated in the middle by an ovate opening 

 and is undoubtedly the cryptocyst of a regenerated 

 zooecium. 



Zooecium with a densely granular ooecium. 

 Harmeria scutulata Busk. 



Colony with an ovate membraniporidan ancestrula sur- 

 rounded by 5 larger and 3 smaller zooecia. 

 Ancestrula with the 5 surrounding larger zooecia. 

 Smaller zooecia with a nearly semicircular aperture. 



