First row: Helix fidelis (California) Helix pomatia (Europe) Liguus fasciatus (Florida) Second row: Cyclophorus appendiculatus (Philippines) Bulimus chiliensis (South America) Third row: Helix albolabris (U. S.) Helix haemastoma (India) Fourth row: Helix profunda (U. S.) Nanina lamarkiana (Philippines) Glandina truncata (Florida) Fifth row: Zonites fuliginosus (U. S.) Achatinella (Sandwich Islands) Helix intorta (Philippines) Bottom row: Cerion microstoma (Cuba) Clausilia macarana (Dalmatia) Bulimulus multilineatus (Florida) Helix nemoralis (Europe) One of the most wonderful and interesting facts connected with the radula is the large number of teeth on each membrane. Thus in some species of our common snails there are seventy-one teeth in a single row, and the whole radula is made up of a hundred rows of teeth, making a grand total of seventy-one hundred teeth in the mouth of a single snail! Land snails are found almost everywhere, in valleys, high up on mountains, and even in deserts. They may be found in the cold climate of Alaska or in the tropical zone under the equator. As a rule, they prefer moist localities, where there is an abundance of vegetation and where the ground is strewn with rotting logs, beds of decaying leaves or moss-covered rocks. Open woodlands may be said to be their best habitat in the northern part of the United States. The shells of the Pulmonata vary to a wonderful degree in size, shape and coloration. Some are so small that they can scarcely be seen with the unaided eye, while others attain a length of six inches; some have the aperture of the shell armed with numerous folds or teeth, while others are smooth and the colors vary from whitish or horn-colored to the gorgeously colored helices of the tropics with their bands and blotches of red, brown, white or green. With all this diversity the land shells or helices may always be distinguished from their salt or fresh-water relatives. The land snails breathe by means of a so-called lung which is a sac lined with a network of blood vessels and occupying the last turn or whorl of the shell. The air taken into this lung purifies the blood. Much is written at the present time upon our new possessions, the Philippine Islands, but few people are aware that these islands are tenanted by the most interesting and beautiful group of all the land shells, the Cochlostylas, or tree snails. The animals live for the most part in the trees and bushes of the islands, the island of Luzon having, probably, the best known fauna. The animals are large and quite bold and the shells are of surpassing beauty, with their colors of white, green, brown, etc. Now that these islands have come into the possession of the United States it is to be hoped that these handsome creatures will receive the study they deserve.