Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 HISTORICAL ZOOGEOGRAPHY 115 stocks of the marine Cerithium which have entered brackish water in different parts of the world (cf. p. 197). The ancient crustaceans of the family Anaspididae, restricted to the fresh waters of Australia and Tasmania and to underground springs in Europe (Bathynella) ,52 have a strikingly discontinuous distribution. Their Paleozoic relatives Uronectes and Palcocaris, indicate
Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 HISTORICAL ZOOGEOGRAPHY 115 stocks of the marine Cerithium which have entered brackish water in different parts of the world (cf. p. 197). The ancient crustaceans of the family Anaspididae, restricted to the fresh waters of Australia and Tasmania and to underground springs in Europe (Bathynella) ,52 have a strikingly discontinuous distribution. Their Paleozoic relatives Uronectes and Palcocaris, indicate a formerly much wider distribution. It is by no means a mere assumption that the northern forms are more advanced. Their superiority has been shown by the practical experiment of introduction. Eurasian forms introduced into Australia and New Zealand have frequently been able to displace the native forms of similar habits. Thus the two predatory marsupials, the 160 140 120 100 80 60 40 20 0 20 40 60 80 100 120 140 160 180
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