VERY welcome to all zoologists, especially to those living in Europe, will be the first part of what promises to be a most useful work on the animals known to inhabit the Mediterranean Sea. For more than twenty-five years Prof. J. Victor Carus tells us he has been collecting the materials for such a volume, and now that he has to be congratulated on the appearance of so much of it, we trust it may not be long ere we shall be enabled to announce that it is complete. The first part gives a list of the Cœlenterates, Echinoderms, and Worms. The next will treat of the Arthropods, Mollusks, and Vertebrates. The author on mature deliberation resolved to omit from the enumeration the Protozoa and Sponges, not seeing his way to give of these satisfactory detailed diagnoses, and also because, while Haeckel and others have done a good deal towards increasing our knowledge of the Mediterranean Protozoa, and Oscar Schmidt and others have done the same with the Sponges, yet the groups have not been rigidly systematised in the same way, for example, as the Cœlenterates.