Abstract
MOST Reptilia are oviparous, but certain of the Lacertilians, and many Ophidians, especially vipers and sea-snakes, are ovo-viviparous—that is to say, the eggs are hatched within the mother, or, as sometimes occurs, during the process of parturition. This is the case with the English viper.
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On the Incubation of Snakes' Eggs2. Nature 43, 68–70 (1890). https://doi.org/10.1038/043068a0
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DOI: https://doi.org/10.1038/043068a0