Keywords: Schematic mollusc3.svg en Anatomical diagram of a hypothetical ancestral mollusc redrawn from T Huxley's 1853 diagram Note that although Huxley does not explain the nature of the long nerve running diagonally posterior from his parieto-sphanclic ganglia or the nature of the ganglion to which it appears to be attached this is most likely what Huxley refers to as the angeial ganglia a pair of ganglia located close to and above the anterior aorta and providing neural control to the ventricle/ auricles/ pericardium 1853 https //commons wikimedia org/wiki/File Hypothetical_Ancestral_Mollusc_by_Huxley jpg T Huxley File Hypothetical Ancestral Mollusc by Huxley jpg PD-old-70-1923 Uploaded with UploadWizard SVG diagrams Mollusca anatomy |