Excerpt from The Dinosaurs of North America

The true place of these reptiles in the animal kingdom has been a matter of much discussion among anatomists, but the best authorities now regard them as constituting a distinct subclass of the Reptilia. Some of the large, earlier forms are apparently related to the Croco dilia, while some of the later, small, specialized ones have various points of resemblance to birds. These diversified characters make it difficult to classify the dinosaurs among themselves, and have led some writers to assert that these reptiles do not form a natural group, but belong to divisions remotely connected and not derived from a common ancestry.

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