Image from Wikimedia Commons. See: https://commons.wikimedia.org/wiki/File:EB1911_Cytology_-_types_of_nuclei.jpg
Artist: a from E. B. Wilson’s The Cell in Development and Inheritance (After van Gehuchten.); b from Korschelt and Heider, Lehrbuch der verg. Entwicklungsgeschichte der wirbellosen Tiere