. Animal life as affected by the natural conditions of existence. Animal ecology. ORGANS OF KESPIEATION. 9 the different Vertebrata go hand in hand with other characters â which distinguish the groups; and although we are not justified in founding the genealogies of Vertebrata exclusively on the character of the lungs, we inay regard and use them as an indication of affinity, particularly when we see that the de- ductions from them coincide with conclusions drawn from other facts. In agreement with this we see that the peculiar. Fig, S.âa, Flying-fish {Exoeetus)^ in which the pectoral fins ser
. Animal life as affected by the natural conditions of existence. Animal ecology. ORGANS OF KESPIEATION. 9 the different Vertebrata go hand in hand with other characters â which distinguish the groups; and although we are not justified in founding the genealogies of Vertebrata exclusively on the character of the lungs, we inay regard and use them as an indication of affinity, particularly when we see that the de- ductions from them coincide with conclusions drawn from other facts. In agreement with this we see that the peculiar. Fig, S.âa, Flying-fish {Exoeetus)^ in which the pectoral fins serve, at least partly, for flight; bf Bat, with a membrane extending between the phalanges, limbs, and tail. construction of the lungs which in birds leads to the develop- ment of pneumatic bones is an hereditary attribute characteristic in the highest degree of the whole order of birds, and of great systematic value. It distinguishes Birds as contrasted with Mammals and Reptiles, but nevertheless can and must be con- ceived of as having originated through modification of a simple organâperhaps a bladder-shaped lungâwhich may have been 2. 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 Semper, C. (Carl), 1832-1893. New York, D. Appleton
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