Abstract
During the last ten years I have published a series of memoirs on different questions concerning the morphology and biology of the Rugose Corals. In these memoirs I have elucidated the ground-form of the polyparium of the solitary Rugosa, the mode of its attachment to the substratum, the origin of the characteristic arrangement of the septa, and the origin of the fossuloe in dependence on this form and attachment. I have established the connexion between the form of the polyparium of the Rugosa (including that of the fossulse) and the life of these corals in definite environmental conditions.