Page:Quarterly Journal of the Geological Society of London, vol. 26.djvu/135

1869.]

The Trias of North America has yielded the remains of two forms of reptiles, Clepsysaurus and Bathygnathus. The teeth, jaw-fragments, and vertebræ of these reptiles have characters which are quite in accordance with those of the Dinosauria, to which group they have lately been referred by Cope and Leidy, and I entertain no doubt that they are Dinosauria; but, unfortunately, none of the remains which have been discovered belong to what may be called diagnostic bones, such as the ilium, the femur, or the tibia.

Assuming, provisionally, that these reptiles are Dinosauria, the distribution of that group and of the other Reptilia and Amphibia of the Trias may be tabulated in the annexed form.

Putting together all the facts now ascertained respecting the distribution of the "Poikilitic" Reptilia, I think that the horizon of all these beds tends to become definitely Triassic rather than Permian.

And, in conclusion, I may draw attention once