. Biology in America. Biology. The Story of the Rocks 139 to her pouch where their mouths become temporarily attached to the mother's teats and where they grow in safety until ready for their second debut in the world. AVell-known ex-- amples are our own opossum, and the Australian kangaroo. The distribution of modern marsupials is very peculiar and with otlier facts has given rise to interesting speculations re- garding the earlier form of Mother Earth. Their repre- sentatives are found today exclusively in Australia and ad- jacent regions, South America and tropical North America, with the e
. Biology in America. Biology. The Story of the Rocks 139 to her pouch where their mouths become temporarily attached to the mother's teats and where they grow in safety until ready for their second debut in the world. AVell-known ex-- amples are our own opossum, and the Australian kangaroo. The distribution of modern marsupials is very peculiar and with otlier facts has given rise to interesting speculations re- garding the earlier form of Mother Earth. Their repre- sentatives are found today exclusively in Australia and ad- jacent regions, South America and tropical North America, with the exception of the opossum of the United States. In. The 8riNY Ant-Eater A luoiiotreme, one of the most prii)iitive of. mammals. Photo by Elivin R. Sanhorn By permisawti of the Xeiv York Zoological Society. Mesozoic and Eocene time however the marsupial stock was distributed over North America and Europe and possibly Asia as well. The distribution of the ostrich in Africa and its relatives, the rhea in South America, and cassowary and emu in Aus- tralia and the East Indies and the recently extinct moa of New Zealand, is similar to that of the marsupials. These facts and other similar ones have led many biologists and palaeontologists to the belief in a migration of life from the northern hemisphere into the southern at some very early period in the earth's history. They have also suggested the existence of former land connections between South Amer-. 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 Young, R. T. (Robert Thompson), b. 1874. Boston, R. G. Badger
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