Page:North American Plesiosaurs- Elasmosaurus, Cimoliasaurus, and Polycotylus.pdf/19

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Am. Jour. Sci., Vol. XXI, 1906.

Plate II.

Fig. 1. Elasmosaurus ischiadicus Williston.

Fig. 2. Elasmosaurus(?) marshii Williston.

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