. Animal life as affected by the natural conditions of existence. Animal ecology. 206 THE INFLUENCE OF INANIMATE SURROUNDINGS. ground. In the first place, in all swimmers, the whole body serves as a means of motion ; snakes and eels or similar crea- tures with very long bodies swim exclusively or in preference by a wriggling motion, and even much shorter animals, as bleak, &c., can swim without fins, but then their power of directing their movements is greatly impaired. Such organs as. Fig. 59.—Various animals that swim by means of fins. Above a fish (Dorsa) ; below a Cachalot Whale; to th
. Animal life as affected by the natural conditions of existence. Animal ecology. 206 THE INFLUENCE OF INANIMATE SURROUNDINGS. ground. In the first place, in all swimmers, the whole body serves as a means of motion ; snakes and eels or similar crea- tures with very long bodies swim exclusively or in preference by a wriggling motion, and even much shorter animals, as bleak, &c., can swim without fins, but then their power of directing their movements is greatly impaired. Such organs as. Fig. 59.—Various animals that swim by means of fins. Above a fish (Dorsa) ; below a Cachalot Whale; to the right a "PteropoJ, ffyalea; left, a Pteivpjdous larva (Creseisf). serve exclusively or elderly to enable swimming animals to move in a determined direction are known by the general term of fins. Notwithstanding the widest difference in their structure, and though they may have but small morphological correspondence in different creatures—as will be understood, without any more detailed comparison, from the subjoined illustration (fig. 59)—• they have, without exception, certain peculiar characters, which. 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 and Co.
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