"Diagram of Lucernaria. C., Cavity of gut (colenteron); F., gastric filaments; H. hypostome; G., gonad; T. tentacle; cc., circumference canal." -Thomson, 1916

Lucernaria

"Diagram of Lucernaria. C., Cavity of gut (colenteron); F., gastric filaments; H. hypostome; G., gonad;…