Surveys the classification of different types of sponges, their distinguishing characteristics, life functions, and usefulness to man. Briefly discusses the sponge-fishing industry and sponge collecting.
Describes the physical characteristics and habits of different species of starfish and discusses their relationship to other sea creatures and human beings.
An introduction to land, sea, and freshwater mollusks, including their classification, physical characteristics and habits, superstitions about them, and their useful as well as unpleasant aspects. Includes a chapter on shell collecting.
Describes the physical characteristics, habits, and natural environment of various species of jellyfish with a discussion of the dangerous aspects of certain species and methods of keeping jellyfish alive in aquariums.
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