Water-Viper, [645], [645]

Weismann, on Axolotl, [64], [114]

Werner, on Eryx, [604]

White's aged Tortoise, [369]

Wilder, on Desmognathus, [103]

Xantusia, [547]

Xantusiidae, [514], [547]

Xenobatrachus, [225];

X. ophiodon, [228]

Xenopeltidae, [593], [605]