EXPLANATION OF PLATES, 



PL-flTE, 16. PAGE 



HELIOPHYLLUM ROWLEYI, N. Sp. 47 



FIG. 1. — Lateral view with portion of the calix broken 

 away to show the lanaellas. 



BLOTHROPHYLLUM CONIFERUM, N. Sp. 46 



FIG. 2. — Posterior view. 



FIG. 3. — Lateral view of another specimen. 



FIG. 4. — Lateral view of another example. 



FIG. 5. — Longitudinal section of a specimen showing 



conical elevation and the lamella*. 

 FIG. 6. — Longitudinal section of another individual 



the showing the vesiculose structure. 



CYSTIPYPHLLUM LOUISVILLENSIS, N. Sp. 45 



FIGS. 7-10. — Oblique views showing the calix and the 

 root-like processes that served for attach- 

 ment. 



F I Q-. 8. — View of the exterior of another example show- 

 ing the large concave vesicles. 



FIG. 9. — Calix view of another specimen. 



ZAPHRENTIS ALBUS, N. Sp. 42 



F X G. 11. — View of the calix from the posterior side. 

 F I G. 12. — View of the calix of another example. 



ZAPHRENTIS CURTUS, N. Sp. 42 



FIG. 13. — Lateral view. 



FIG. 14. — Calix view of another specimen. 



ZAPHRENTIS INFLEXUS, N. Sp. 43 



FIG. 15. — Lateral view with a portion of the calix brok- 

 en away to show the side of the cup. 

 FIG. 16. —Calix view of another individual. 



ZAPHRENTIS PUSILLUS, N. Sp. 43 



F I G. 17. — Posterior view giving portion of the fossette. 

 FIG. 18. — Lateral view of another example. 

 FIG. 19.— Calix view of another specimen. 



