Simosaurus, [477]

Siphonops, [86], [87], [90]

Siredon (Axolotl), [112]

Siren, [96];

S. lacertina, [136], [136]

Sirenidae, [94], [96], [136]

Sistrurus miliarius, [647]

Skeleton, figured, of Testudo, [319];

of Chelone, [320];

of Brontosaurus, [418];