. Carnegie Institution of Washington publication. GEOGRAPHICAL DISTRIBUTION. 31 A glance at fig. 9 will show at once the great influence of heat and cold and the lack of moisture. In western Europe, warmed by the sea, the turtles are represented by a species which ranges nearly as far north as St. Petersburg; while in Central Asia none is known to occur north of Turkestan and the Himalaya Mountains. The southern portion of Arabia and the greater portion of the Sahara Desert are without turtles, on account of the dryness of the climate. In North America the high and cold range of the Rocky Moun

. Carnegie Institution of Washington publication. GEOGRAPHICAL DISTRIBUTION. 31 A glance at fig. 9 will show at once the great influence of heat and cold and the lack of moisture. In western Europe, warmed by the sea, the turtles are represented by a species which ranges nearly as far north as St. Petersburg; while in Central Asia none is known to occur north of Turkestan and the Himalaya Mountains. The southern portion of Arabia and the greater portion of the Sahara Desert are without turtles, on account of the dryness of the climate. In North America the high and cold range of the Rocky Mountains supports no chelonian life. On account of its dryness, the western coast of South America has no turtles; and the southern extremity of the continent none, on account of its coldness. So much can we say with regard to turtles in general; but when we come to study the different groups we shall find that thev are often absent from regions where the conditions appear to be wholly favorable for their existence.. Fig. 9.—Map showing geographical distribution of living turtles, excepting those strictly marine. Occupied areas ruled with parallel lines, except some small islands, which are in solid black. Fig. 10 is intended to display the distribution of the Cryptodira. It is seen to differ from the previous map principally in that it shows that Australia possesses no representatives of the superfamilv.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Carnegie Institution of Washington. Washington, Carnegie Institution of Washington