1. _Stromatoporæ._ It has been usual of late to regard these as allies of the modern Millepores and Hydractineæ; but careful study of large series of specimens has convinced me that some species, notably the _Stromatocerium_ of the Cambro-Silurian and the _cryptozoum_ of the Cambrian, cannot be so referred. I hope to establish this in the future, if time permit. 2. Modern Foraminifera. The discovery by Brady and Lister of reproductive chamberlets at the margin of the modern _orbitolites_, tends to connect this with Eozoon. The gigantic foraminiferal species discovered by Agassiz at the Gallipagos, has points of affinity with Eozoon; and its arenaceous nature does not affect this, as we know sandy species in this group closely allied to others that are calcareous. _WHAT MAY BE LEARNED FROM EOZOON._ DEDICATED TO THE MEMORY OF DR. WILLIAM B. CARPENTER, Who, among his many Services to Science, devoted much Time and Labour to the Investigation of Eozoon, and by his Knowledge of Foraminifera and unrivalled Power of unravelling difficult Structures did much to Render it intelligible. The Microscope in Geology--Contributions of the Study of Eozoon to our Knowledge of the Mode of Preservation of Fossils--Its Teaching Relatively to the Origin of Life and the Laws of its Introduction and Progress [Illustration: Specimen of Eozoon Canadense (Dawson), showing General Form and Osculiform Tubes. (Reproduced from Photograph.)] CHAPTER VI. _WHAT MAY BE LEARNED FROM EOZOON._