Two exampls of double-tailed lizards, Takydromus tachydromoides SCHLEGEL and Anolis c. carolinensis, were examined. The Takydromus possessed a normally regenerated tail laterally, and an abnormally regenerated tail ventrally. X-ray photography showed the 38th vertebra bent ventrally at an angle of 90. Both the vertebra and the core of the ventral tail stained red with Mall's Arizalin red-S, indicating that the core was formed of cartilage, or chondrin, or cartilagious tissue. This tail is presumed to have arisen from a broken bone. The regenerated tail of the Anolis was normal, without any Vertebrae.

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