REPTILES, with shorter articles such as SNAKE, CROCODILE, NOSAURIA, LIZARD, GECKO, etc. ; a general article FISHES, with sidiaries such as FISHERIES, HERRING, COD, SALMON, EEL, SHARK, etc. ; a general article CRUSTACEA, with supplementary articles on the important subdivisions, COPEPODA, MALACOSTRACA, etc., and on such important forms as CRAB, LOBSTER, SHRIMP, WOOD-LOUSE and others. The better known fossil animals are also given separate articles, e.g., DINOSAURIA, TRILOBITA, ICHTHYOSAURUS, TOLITES, ARCHAEOPTERYX, TITANOTHERIA, PERISSODACTYLA. The various methods of protecting animals and preserving wild life are covered by such articles as BIRDS, PROTECTION OF, NATURE SERVES, BIRD SANCTUARIES and GAME RESERVES ; On this aspect, too, the article BIOLOGICAL SURVEY has an important section, while ZOOLOGICAL GARDENS, AQUARIUM and AVIARY deal with animals in captivity. The great advance in the more detailed knowledge of the cells and tissues of the animal body of recent years is summarized in CYTOLOGY, REGENERATION IN ANI