. Animal life as affected by the natural conditions of existence. Animal ecology. 152 THE INFLUENCE OF INANIMATE SURROUNDINGS. live in pure fresh water. When I was still a student, Cor- dylophora lacuatris (fig. 40) was found only in estuaries and at the mouths of rivers where the water was at any rate occa- sionally salt or brackish; it was discovered almost simul- taneously in England and Belgium, and somewhat later I found it in the Schlei, near Schleswig. Since that time, 1854, the animal has in many places migrated into rivers; it has already reached the Seine at Paris, and has got into t
. Animal life as affected by the natural conditions of existence. Animal ecology. 152 THE INFLUENCE OF INANIMATE SURROUNDINGS. live in pure fresh water. When I was still a student, Cor- dylophora lacuatris (fig. 40) was found only in estuaries and at the mouths of rivers where the water was at any rate occa- sionally salt or brackish; it was discovered almost simul- taneously in England and Belgium, and somewhat later I found it in the Schlei, near Schleswig. Since that time, 1854, the animal has in many places migrated into rivers; it has already reached the Seine at Paris, and has got into the fresh-. FiG. i^.^Cordylcphora lacustris {from P. E. Schultze), a brackish-water polyp wWch within the last ten years has gradually migrated into pure fresh water. water aquarium of the Jardin des Plantes there, where it is said to be very common. Its migrations in the Elbe were still more remarkable. After reaching Hamburg, and even, if I am not mistaken, finding its way into the Alster, it took possession at the same time of the great water-pipes of the city, in which it lived, a;ssociated with the well-known bivalve, Breissena polymorpha, in such enormous quantities as to impede the flow of water through- the pipes. This case is the more interesting. 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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