Illustrates and describes the forms and habits of seashore plants and animals and relates them to their environment.

Provides descriptions and keys for the identification of 3 species of feather stars, 21 species of starfish, 20 species of brittlestars, 17 species of sea urchins, and 33 species of sea cucumbers.

Examining the creatures that inhabit our seas, rivers, lakes and oceans, this encyclopedia takes a journey through the underwater world, uncovering the thousands of species that live and breed in the aquatic environment.