EXPLANATION OF PLATES. 



PLATE, 56. PAGE 



HELIOPHYLLUM GRADATUM, N. Sp. 185 



FIG. 1 — Lateral view of a large corallum. 



FAVOSITES LOUISVILLENSIS, N. Sp. 186 



FIG. 2 — Ventral view of a large piece showing the spines in the 

 tubes, and the contrast between the preserved and the weathered 

 portion of the corallum. 



ZAPHRENTIS SUBCENTRALIS, N. Sp. 186 



FIGS. 3-4 — Calix views of two different examples. 



FIG. 5 — Posterior view of the lamellae and position of the fosette. 



ZAPHRENTIS CLINATUS, N. Sp. 187 



FIGS. 6-7 — Lateral views of two different specimens. 

 FIGS. 8-9 — Calix views of two different examples. 



A 



CYATHAXONIA VENUSTIW. 187 



A 



FIGS. 10-11-12 — Lateral views of three different specimens. 



FIGS. 13-14-Calix views of two different examples. For further illus- 

 tration and description see Contribution to Indiana Palaeontology, 

 Part II, page 9, plate IV, figures 14, 15, 16, 17, January 20, 1899. 



