SYNOPTICAL CLASSIFICATION. 15 



** With dorsal avicularia. 



19. Amastigia. 



ft. Avicularia, -when present pedunculate ; no vibracula. 



Fam. 6. BICELLARIID^. 



* Cells turbinate, distant ; oral and other spines. 



20. BiCELLARIA. 



** Cells contiguous ; unarmed. 



21. Halophila. 



*** Cells elliptical, contiguous ; with pedunculate avicularia. 



22. Bugula. 



(i) Foliaeeee. Polyzoarium foliaceous, expanded, entire or lobed. 



Fam. 7. FLUSTRID^. 

 a. Cells contiguous. 



* In two layers. 



23. Flustra. 



** Cells in a single layer. 



24. Cakbasea. 



8. Cells discrete. 



25. DiACHORIS. 



2. Cylindricce. Cells disposed around an imaginary axis. 



Fam. 8. FARCIMINARIIDJS. Corneous ; a large aperture. 



26. Fakciminaria. 



3. Geminatce. Cells in pairs. 



Fam. 9. GEMELLARIID^. 

 (a) Armafce. Furnished with avicularia. 



27. Notamta. 

 (6) Inarmatce, 



* Cells back to back in the same plane. 



28. Gemellaria. 



** Cells back to back, the alternate pairs at right angles, 

 t Each pair arising from that immediately below. 



29. DiMETOPIA. 



tt Each pair arising from the next but one below, 



30. Calwellia. 



