Keywords: PZSL1907Page506.png Sertularia versluysi <small>Nutt </small> Sertularia marginata <small> Kirchenpauer 1864 </small> en Male gonosome <br/> ap aperture blst blastostyle col central column of gonophore ect ectoderm end endoderm gon gonophore gub gubernaculum sp spermary w gonangium wall Proceedings of the Zoological Society of London http //archive org/details/proceedingsofzoo19074471121zool vol 1907 issue 3 http //archive org/stream/proceedingsofzoo19074471121zool page/506/mode/1up page 506 1907 James Ritchie text PD-old PZSL 1907-3 Sertularia marginata |