Keywords: Plate XIII - Report on certain Hydroid, Alcyonarian, and Madreporarian Corals procured during the Voyage of H.M.S -ext3.png Three-barbed nematocyst of the form peculiar to Bydrozoa occurring in the tentacles of the zooids and also sparingly on the general surface of the coral a The cell with its head protruded and thread partially projected b The cell in the unexpanded condition The figures are drawn exactly to measurements Structures occurring in Millepora nodosa 2012-04-13 File Plate XIII - Report on certain Hydroid Alcyonarian and Madreporarian Corals procured during the Voyage of H M S Challenger jpg Creator Henry Nottidge Moseley Atelier graphique Custom license marker 2012 04 13 PD-Challenger Report Uploaded with UploadWizard Henry Nottidge Moseley Millepora exaesa |