Fig 
d: 
9 
2 
O. 
11 
EXPLANATION OF PLATES, 
Plate I. 
Rhizotrochus radiatus—a, corallum, natural size; b, calice, magnified 
1:5 diam. 
Balanophyllia dilatata—a, corallum, magnified 2 diam. ; b, portion of 
calice, showing one system of septa, magnified. 
Platytrochus compressus— а, соға Пат, magnified 2 diam. ; b, calice, 
magnified 4 diam. 
Trematotrochus Verconis—a, corallum, magnified 3 diam. ; 5, calice, 
magnified 6 diam. 
Plate II. 
Deltocyathus Vincentinus—a, corallum, magnified 4 dium. ; 0, calice, 
magnified 4 diam. ; c, base, magnified 4 diam. 
Homophyllia australis—calice, magnified 1:5 diam. 
Plesiastrea proximans— а, eorallum, magnified 2 diam. ; b, a calice, 
magnified. 
Holcotrochus crenulatus—a, соға Пат, magnified 5 diam. ; b, end view 
of corallum, magnified 5 diam. ; c, calice, magnified 10 diam. 
