North American plesiosaurs: Elasmosaurus, Cimoliasaurus, and Polycotylus

S. W. Williston

1906

Article

The American Journal of Science, series 4 21:221-236

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Taxa discussed in this work:

• Elasmosaurus marshi
• Elasmosaurus sternbergi
• Polycotylus dolichopus
• Thalassonomosaurus marshii
• Thalassonomosaurus nobilis

Taxonomy:

• Elasmosaurus marshi belongs to Elasmosaurus - Williston (1906)