Excerpt from Triassic Ichthyosauria: With Special Reference to the American Forms

In the initial stages of the work the writer was greatly indebted to Presi dent Benjamin Ide Wheeler of the University of California, through whose support it was made possible to extend the scale of the. Investigation so as to cover the broader field of the evolution of the Ichthyosauria as a whole.

In the field work carried on in connection with the investigation of the oc currence and age of the Triassic ichthyosaurs, the writer has been particularly indebted to Professor James Perrin Smith, whose knowledge of the inverte brate faunas has furnished a most valuable basis for correlation.

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