Interpretive tracing of fig. 2 from Wharton and Jenkins (1978) [120] showing a TEM of a “transverse section of the egg of Trichuris suis within the uterus of a gravid female” showing locations of various egg layers labeled under the new scheme. Note in original the obvious Electron-dense Parietal Coating and Permeability Barrier Membrane (neither addressed by the authors), and circular fibers in the Spatio Externum (in original).