. Bulletin - United States National Museum. Science. TEIID LIZAItDS OV THE GENUS CNEMIDOPHORUS 75 differences from (julai-is, it is considered to be a deriviti^'e from the ancestral stock of the modern deppi/'. Its iiumncr of oriiiin is a matter of some doubt us indicated in tlie discussion of its affinities. Because of its coextensive distribution Avith the parent form, specia- tion by mutation, in phice, is at first sight indicated. It is thought, however, that the natural geological changes that have occurred in. Figure IS.—Map showing distribution of forms of deitii group the region of Cen
. Bulletin - United States National Museum. Science. TEIID LIZAItDS OV THE GENUS CNEMIDOPHORUS 75 differences from (julai-is, it is considered to be a deriviti^'e from the ancestral stock of the modern deppi/'. Its iiumncr of oriiiin is a matter of some doubt us indicated in tlie discussion of its affinities. Because of its coextensive distribution Avith the parent form, specia- tion by mutation, in phice, is at first sight indicated. It is thought, however, that the natural geological changes that have occurred in. Figure IS.—Map showing distribution of forms of deitii group the region of Central America and Mexico, in this case at the isthmus of Tehuantepec, may have permitted speciation during a temporary period of isolation. Even this theory is thought to be in accordance with the principle of speciation by mutation, which in itself repre- sents the sort of variation that is thought to give rise to new forms. For a discussion and diagram of the possibilities of this theor}^ as applied to deppii and guttatus see pages 73 and 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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