<i>Cordylophora caspia</i> (=<i>Cordylophora lacustris</i>; Hydrozoa: Anthoathecatae: Filifera: Oceaniidae), a portion of a female colony:
<ul><li><ul><li><b>a</b> – very young gonophore;</li>
<li><b>b</b> – gonophore more advanced, containing ova, which are embraced by the branches of a ramified spadix, and have their germinal vesicles distinct;</li>
<li><b>c</b> – gonophore still further advanced; the ramifications of the spadix have disappeared, and the segmentation of the vitellus has been completed in the ova;</li>
<li><b>d</b> – further stage of development, in which the ova have become planulae, and are ready to escape from the gonophore;</li>
<li><b>e</b> – the gonophore has become ruptured at the summit, and the ciliated planulae are escaping into the surrounding water.</li></ul></li></ul>
<bdi><a href="https://en.wikipedia.org/wiki/en:George_Allman_(natural_historian)" class="extiw" title="w:en:George Allman (natural historian)"><span title="Irish natural historian (1812-1898)">George James Allman</span></a>
</bdi>
Allman G. J. The Monograph of the Gymnoblastic or Tubularian Hydroids. –  Conclusion of Part I and Part II. – London: Robert Hardwicke, 1972. – <a rel="nofollow" class="external text" href="https://www.biodiversitylibrary.org/item/37418#page/19/mode/1up">Plate III</a>