EXPLANATION OF PLATES. 



FL.f\TE 20. PAGE 



HELIOPHYLLUM HAMMELLI, N. Sp. 55 



FIG. 1. — Ventral view of a large corallum. 



FIG. 2. — Longitudinal section of a single corallite of 



No. 1. 

 FIG. 3. — Ventral view of another smaller corallum. 



HELIOPHYLLUM COLLATUM, N. Sp. 55 



FIG. 4-6. —Ventral views of two different examples ex- 

 hibiting the rounded tubes. 



FIG. 5. — Lateral view of another corallum. 



FIG. 7. — Ventral view exhibiting the margin of the 

 tubes joined in polygonal outline. 



ENALLOPHYLLUM GRABAUI, N. Sp. 54 



FIGS. 8-9-12. — Lateral views of three examples exhib- 

 iting the calicular budding. 



FIG. 10. — Lateral view of a small corallum, exhibiting 

 the broad scar at the point of attachment. 



FIGS. 11-13-14-18.— Anterior views of different co- 

 rallums. 



FIGS. 1.5-16-17. — Lateral views of three corallums, 

 where the sides are broken away to show the 

 tabulate area. 



ROMINGERIA CYSTOIDES, N. Sp. (Grabau.) 52 



FIGS. 19-22. — Lateral views of different corallums. 

 FIGS. 20-21-23. — Ventral views of three examples ex- 

 hibiting the different modes of growth. 



