Koch, Die Reformation im Herzogtum Julich 1883-1888).
(Af ter von Koch.) formed, the endoderm of the basal disk lying above the basal plate is raised up in the form of radiating folds.
(C original; the rest after von Koch.) aporose corals, the only communication between the cavity of the edge-zone and the general cavity of the zooid is by way of the lip of the calicle; in the latter, or perforate corals, the theca is permeated by numerous branching and anastomosing canals lined by endoderm, which place the cavity of the edge-zone in communication with the general cavity of the zooid.
Von Koch, Fauna and Flora des Golfes von Neapel, xv.