EXPLANATION OF PLATE 15 



Figs. 1-4 Coleophyllumf greeni Rowley ; xl p. 62 



Side views ; from Rowley. 



Fig. 5 Cleistopora procera (Rowley); X 1 . • p. 58 



Side view of colony ; from Rowley. 



Fig. 6 Cleistopora ramosa (Rowley) ; holotype; X 1 p. 58 



Side view of colony ; from Rowley. 



Fig. 7 Palaeacis humilis Hinde ; paratype ; X 5 p. 56 



Cross-section of a colony of four corallites, showing the mural pores characteristic 

 of the genus ; after Hinde. 



Fig. 8 Microcyathus cyclostoma (Phillips); X 8 p. 60 



Cross-section of a colony of three or four corallites attached to a gastropod shell ; 

 dense tissue at the floor of the calyces and reticulate tissue within the walls are char- 

 acteristic of the genus ; after Etheridge and Nicholson. 



