. Animal life as affected by the natural conditions of existence. Animal ecology. MAK1NE FORMS IX FRESH WATER. 147 common also in the magnificent Laguna do Bay near Manila. Sea-fishes, which normally live also in fresh water, or which thrive well when into it, are by no means rare ; thus Peters found Hays deep in the heart of East Africa; the Lake of Acqua, near Padua, which is of pure fresh water, has become famous by the success of an attempt made there to breed sea-fish—Mugil (the grey mullet) and Labrax (the basse)—in great numbers for the market. Among the Invertebrata such ca
. Animal life as affected by the natural conditions of existence. Animal ecology. MAK1NE FORMS IX FRESH WATER. 147 common also in the magnificent Laguna do Bay near Manila. Sea-fishes, which normally live also in fresh water, or which thrive well when into it, are by no means rare ; thus Peters found Hays deep in the heart of East Africa; the Lake of Acqua, near Padua, which is of pure fresh water, has become famous by the success of an attempt made there to breed sea-fish—Mugil (the grey mullet) and Labrax (the basse)—in great numbers for the market. Among the Invertebrata such cases are yet more common. Palcemou, a genus of Crustaceans which inhabit fresh water almost exclusively, belongs to a family which generally includes none hut marine animals; various species of this genus live in rushing mountain streams in the Philippines, and are found at an elevation of 4,000 feet or more above the sea. In the branchial cavity of this Crustacean. Flo. 38.— Bopyrus nscendrns a, the lower; 6. the npper side. It lives in the gill cavity of Pttlmmon ornat'M (Oliv.), and is found with it ascending fresh-water streams at a height of 4,000 feet above the sea. All the other known species are marine. lives a species, as yet undescribed, of the genus Bopyrus (fig. 38), which I have named Bopyrus ascendens. It is the only fresh- water form hitherto known, while the other very numerous species live exclusively in the branchial cavities of sea crabs. Aucapitaine states that a true Cyprcea—the species known as the money cowry—is caught in the interior of Africa, near Timhuctoo, in quantities by the natives ; various molluscs of the family of ship-borers—Nausitara Dunlopi (Wright) and Teredo senegalensis (Blain.)—and of the Pholadidae—Martesia rivicola—live in the rivers of India and Java, while all the other species of these famdies are true marine creatures. I ate oysters (fig. 39) at Basilan in the south of Mindanao, which, although they had a salt flav
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