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doi: 10.1038/035344a0
ATTENTION has recently been drawn to abnormalities in the vertebral column of Rana. (See Bourne, Quarterly Journal of Microscopical Science, January 1884; Howes, Anatomischer Anzeiger, 1 Jahrgang, 1886, Nr. 11; Lloyd Morgan, NATURE, November 1886.) One form of such abnormality is the addition of a supernumerary (tenth) vertebra.
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