Edwardsia claparedii - A, <i><a href="https://en.wikipedia.org/wiki/Edwardsia" class="extiw" title="en:Edwardsia">Edwardsia claparedii</a></i> (after A. Andres). <i>Cap</i>, capitulum; <i>sc</i>, scapus; <i>ph</i>, physa.<br>B, Transverse section of the same, showing the arrangement of the mesenteries, <i>s</i>, Sulcus; <i>sl</i>, sulculus.<br>C, Transverse section of <i><a href="https://en.wikipedia.org/wiki/Halcampidae" class="extiw" title="en:Halcampidae">Halcampa</a></i>. <i>d, d,</i> Directive mesenteries; <i>st</i>, stomodaeum.<br>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 - Public domain - Wikimedia Commons