1. Owing to lack of space, many authors whose work is discussed in the foregoing article could not be cited in the text. The reader will find references to their work, as well as that of the few representative authors named above, in the relevant chapters or the bibliography of the book: Tischendorf, F., Die Milz, in: Handbuch der mikroskopischen Anatomie des Menschen, vol. VI, part 6, pp. 1–968. Ed. W. Bargmann. Springer-Verlag, Berlin/Heidelberg/New York 1969. The literature in this bibliography is restricted to work published before 1969, but since then no major contributions to the phylogeny of the spleen have come to mynotice.