"Life history of a coral, Monoxenia darwinii. A, B, Ovum. C, Division into two. D, four-cell stage. E, Blastula. F, Free-swimming blastula with cilia. G, Section of blastula. H, Beginning of invagination. I, Section of completed gastrula, showing ectoderm, and archenteron. K, Free-swimming ciliiated gastrula." -Thomson, 1916

Coral Stages

"Life history of a coral, Monoxenia darwinii. A, B, Ovum. C, Division into two. D, four-cell stage.…