Note 12 — ADAM SEDGWICK, M.A., (continued 2)
Reading edition
Kowalevsky (Beiträge zur Entwicklungsgeschichte der Holothurien, Mémoirs de l'Ac. Imp. de St Petersbourg, vii ser., Vol. XI. 1867) describes the division of nuclei during segmentation in the Holothurians, and other observers have described it elsewhere.