Plate, dorsal and ventral aspects of pseudoembryo by [Edwin M Williams] Figures 5 and 7 from plate XXIV showing the dorsal aspect of the pseudoembryo of the Antedon rosaceus shortly after rupture of vitelline sac and the ventral aspect of the pseudoembryo later on. Subject: Oceanography Published in Philosophical Transactions as 'On the embryogeny of Antedon rosaceus, Linck (Comatula rosacea of Lamarck)'. Communicated by Thomas Henry Huxley. Received by the Royal Society on 29 December 1862. Read 5 February 1863. December 1862