Interpretive tracing of completed eggshell of Ascaris lumbricoides from fig. 17 of Foor (1967) [39]. Please consult original and note that the ejected nucleus had been labeled as polar body #1 but it appears to be inside the Permeability Barrier Membrane (in the Spatio Internum) rather than in the Spatio Externum (which Foor had called the “ascaroside layer”). Since the polar body is in the inner of the two compartments, it should probably be considered as polar body #2 [83].