The authors, while enjoying the ease of a steamer chair on a joint trip to Europe in 1922, and discussing somewhat idly at first the taxonomic position of the graptolites, discovered to their mutual great satisfaction that they had arrived independently at the conviction that the graptolites are an early and long extinct branch of the bryozoans. It was then decided to bring the evidence together and jointly publish the result. Other interests have delayed the execution of this plan to the present day, but the long interval of time has also served to produce new and more conclusive evidence.

We will refrain here from giving a lengthy account of the various views that have been held concerning the taxonomic relations of the graptolites since both Elles and Wood (1901–1918) and the junior author (1904) have fully covered the ground. It may suffice to state that a large . . .

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