EXPLANATION OF PLATES. 



PLATE 40. PAGE 



ALVEOLITES DISPANSA, N. Sp. 138 



FIGS. 1-2-3 — Ventral views of three examples. 



ALVEOLITES SUBANGULARIS, N. Sp. 138 



FIGS . 4-5-6 — Ventral views of three small corallums. 



HELIOPHYLLUM CONVERGENS. 139 



FIGS. 7-8-10-11-13— Views of the calix. 



FIG. 9 — View of anterior side showing the wrinkled surface. 



FIG. 12 — Calix view exhibiting two small bnds. 



HELIOPHYLLUM ZENKERI. 139 



FIG. 14 — View of anterior side showing the wrinkled surface. 

 FIGS. 15-16-17-18— Calix views of different corallums. 



