ropsida, which includes the Reptiles, and Birds; and lastly Mammalia.

Ichthyopsida is derived from two Greek words, ichthus, a fish, and opsis, appearance. Sauropsida comes from two Greek words, sauros, a lizard, and opsis, appearance.

NOTICE TO TEACHERS.

To those who care to pursue the subject more in detail with their classes, or to present the history of those groups of animals of which no mention has been made in this book, the author would suggest the following publications, among many others of value, as works of reference :

Woodward's Manual of Mollusca.

Marine Mammalia and American Whale-Fishery. By Captain C. M. Scammon, U. S. R. M.

Sea-side Studies in Natural History. By Mrs. Agassiz and Alexander Agassiz. Corals and Coral Islands. By Prof. J. D. Dana.

Packard's Guide to the Study of Insects.

Insects injurious to Vegetation. Harris.

The Annual Reports of the State of Missouri on the Noxious, Beneficial, and other Insects. By Prof. C. V. Riley.

United States Fish Commissioners' Report for 1871-'72. By Prof. Spencer F. Baird. Containing valuable illustrated chapters on the Mollusca, Crustacea, Worms, etc., by Prof. A. E. Verrill and S. I. Smith.

Key to North American Birds. By Dr. Elliot Coues, U. S. A.

Osteology of Mammalia. Flower.

A History of North American Birds.

Canadian Entomologist.

Forms of Animal Life.

Rolleston

By Baird, Brewer, and Ridgeway.

Methods of Study in Natural History. By Prof. L. Agassiz.

And for general information, the works of Darwin, Huxley, Owen, Wallace, Mivart, Lubbock, and the Duke of Argyle, and also

Nature, a weekly magazine published in London, and containing an infinite variety of contributions from English and Continental naturalists.

The American Naturalist, a popular illustrated magazine of natural history. Edited by Dr. A. S. Packard and F. W. Putnam, and published in Salem, Massachusetts; containing a vast amount of information by Lockwood, Allen, Coues, Verrill, Smith, Stearns, Scudder, Emerton, Gill, Putnam, Packard, Hyatt, Mann, Marsh, Dall, Cooper, Gill, Cope, Ridgeway, Wood, Abbott, Trippe, Le Conte, Wyman, Dawson, Grote, Mayer, Gentry, Shaler, Wilder, Aikin, Treat, Perkins, Riley, Agassiz, Dana, Hill, Uhler, Edwards, Tuttle, Tenney, Ward, Hagen, Hartt, Shimmer, Hartshorne, Ritchie, Tilsdale, Hoy, Orton, Lewis, Leidy, Brigham, Scammon, Binney, Stimpson, Collins, Fowler, Walker, Jordan, Wright, Norton, Maynard, Canfield, Fellowes, Endicott, and others.

The Popular Science Monthly, edited by Prof. E. L. Youmans, and published by D. Appleton & Co., New York; containing valuable illustrated articles by American and European naturalists.

Every school library should, if possible, contain a complete set of Nature, the Naturalist, and The Popular Science Monthly. For special descriptions of species, the miscellaneous collection of the Smithsonian Institution, with contributions by Stimpson, Gill, Bland, Binney, Prime, Tryon, and others. Also the American Journal of Science and Art, and the publications of the Boston Society of Natural History, Philadelphia Academy of Sciences, New York Lyceum of Natural History, Buffalo Academy of Natural Sciences, California Academy of Natural Sciences, Portland Society of Natural History, Museum of Comparative Zoology, Peabody Academy of Science, etc.

All these last-named publications should be found in the larger libraries of the country.

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