IN pre-war days we were accustomed to rely overmuch on Germany for text-books of zoology and palaeontology. In the latter science all that this country could show for fossil invertebrates was the useful examination-candidate's manual by Mr. Woods and one of the British Museum guides, which, though written for another purpose, was used as a text-book by some teachers. Now, thrown more on our own resources, we have not only a revised edition of the Cambridge book, but also a corresponding work from Dr. Morley Davies, of the Imperial College of Science, and a more general introduction by Mr. Hawkins, of University College, Reading. Apart from brief chapters on vertebrates and plants by Dr. Davies, each of these books deals only with invertebrates, so that it is easy to draw comparisons which may be profitable. An Introduction to Palaeontology. By Dr. A. Morley Davies. Pp. xi + 414. (London: Thomas Murby and Co., 1920.) Price 12s. 6d. net. Invertebrate Palaeontology: An Introduction to the Study of Fossils. By H. L. Hawkins. Pp. xix + 226 + xvi plates. (London: Methuen and Co., Ltd., 1920.) Price 6s. 6d. net. Palaeontology: Invertebrate. By H. Woods. Fifth edition. (Cambridge Biological Series.) Pp. viii + 412. (Cambridge: At the University Press, 1919.) Price 12s. 6d. net.