English: A, Schematic longitudinal section through a zooid and bud of Stylophora digitata. In A, B, and C the thick black lines represent the soft tissues; the corallum is dotted. s, Stomodaeum; c, c, coenosarc; col, columella, T, tabulae.
B, Similar section through a single zooid and bud of Astroides calicularis.
C, Similar section through three corallites of Lophohelia prolifera. ez, Edge-zone.
D, Diagram illustrating the process of budding by unequal division.
E, Section through a dividing calicle of Mussa, showing the union of two septa in the plane of division and the origin of new septa at right angles to them.
(C original; the rest after von Koch.) Illustration from 1911 Encyclopædia Britannica, article Anthozoa.
This image comes from the 13th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.