This book is a summary of the diversity between and within the classes of animals. It is intended for reference on all aspects of animals that can be studied comparatively, but such comparisons requires that the occurrence of the feature in question beknown for more than just one or two groups. It is in large part a book on invertebrate animals because the vertebrates from only a small part of the diversity of animals.

With the award of the Walther Rathbone Bacon Scholarship to the author in 1935 for the study of the fauna of regions outside the United States, a program was developed for the collection of Staphylinidae on each of the islands from Cuba to Trinidad; examination of all local collections; the study of types in the British Museum and the collection of Dr. Malcolm Cameron; the mounting, labeling, and sorting of the collections assembled; the identification of the species; and the preparation of a report, to included a systematic revision of the family as it occurs in the West Indies.

This book is a summary of the diversity between and within the classes of animals. It is intended for reference on all aspects of animals that can be studied comparatively, but such comparisons requires that the occurrence of the feature in question beknown for more than just one or two groups. It is in large part a book on invertebrate animals because the vertebrates from only a small part of the diversity of animals.

This book is primarily a monograph of the reproductive diversity among animals, including protozoans. This diversity is listed for each group in Chapter 6; it is cross-listed by process in chapter 7.