8 (7) Rudimentary columella formed by fusion of lower inner edges of larger septa; corallum usually intact 



(7) No columella; corallum invariably fragmented 



(Fig. 9) Flabetlum macandrewi 



Figure 9. — FlabeBum macandrewi; 

 side view. Scale: 1 cm. 



9 {S) Calice compressed or constricted in center (Fig. lOA, B) Flabellum alabastrum 



Figure \0.— FlabeBum alabastrum: A, calicular view showing conslricled calice; B, side view. Scale: 2 cm. 



9 (8) Calice a regular ellipse (Fig. 11) . . 



Flabellum angulare 



Figure 11. — flabellum angulare: 

 side view. Scale: 2 cm. 



