PLATE 1 



Fig. 1 Crisia cribraria, a characteristic internode. 



Fig. 2 The same, side view of ooecium and ooeciostome. 



Fig. 3 Crisia ehurnea, characteristic internode. 



Fig. 4 The same, side view of ooecium and ooeciostome. 



Fig. 5 Idmonea atlantica, mode of branching and arrangement of zooecia. 



Fig. 6 The same, detail of ooecium and ooeciostome (Kogick, after Osburn). 



Fig. 7 Diplosolen ohelium, edge of zoariuin, showing ooecium with ooeciostome 



and other details. 



Fig. 8 Lichenopora verrucaria, young colony. 



Fig. 9 Tuiulipora lohulata, habit sketch and portion of a lobe. 



Fig. 10 Crisia cribraria, detail of ooeciopore. 



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