In this paper, I present an important, yet hitherto neglected, development within Husserl’s phenomenological formal ontology. The first sixteen paragraphs of Ideas 1 serve as the point of departure for my presentation. In these paragraphs, Husserl presents the category of “concretum”, or concrete individual, as the cornerstone of his whole formal-ontological framework. The aim of this paper is to present and discuss a revision of the account of the concrete individual Husserl develops in his Ideas 1 in 1918 in a text that is now published as text 11 in Husserliana 41. I will also draw out some further implications from a text of the same year published as Appendix XVII of Husserliana 41. No adequate treatment of the 1918 account of “concrete individual” has been provided so far, however, and my paper aims at filling this gap in the scholarship. The relevance of the 1918 revision is phenomenological and philosophical, rather than just historical. In that text Husserl solves some ambiguities in the Ideas 1 treatment of concrete individuals, and, in doing so, he introduces an original distinction between two types of genera, self-individuating and other-individuating. He also provides elements to a phenomenological doctrine of the principle of individuation and takes a stance on the question of the individuation of essence.