Diagram of the arrangement of the septa in a Zaphrentid coral. <i>m</i>, Main septum; <i>c</i>, counter septum; <i>t, t</i>, alar septa. Illustration from 1911 Encyclopædia Britannica, article <a href="https://en.wikisource.org/wiki/1911_Encyclop%C3%A6dia_Britannica/Anthozoa" class="extiw" title="s:1911 Encyclopædia Britannica/Anthozoa">Anthozoa</a>.
Encyclopædia Britannica, 1911
2012-08-15
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