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

 

4. Dinosauria from the Trias of North America.

The Trias of North America has yielded the remains of two forms of reptiles, Clepsysaurus and Bathygnathus^[1]. 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.

North America.

Britain.

Germany.

Ural Mountains.

Central India.

South Africa.

Reptilia—

1. Crocodilia

   ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

Stagonolepis.

Belodon.

1. ................................................................................................................................................................................................................................................................................................................................................................................................

Parasuchus.

Pristerodon?

1. Dinosauria

   ................................................................................................................................................................................................................................................................................................................................................................................................

Clepsysaurus,

Thecodontosaurus,

Palæosaurus,

Deuterosaurus,

Ankistrodon.

Bathygnathus.

Teratosaurus,

Palæosaurus,

Teratosaurus,

Cladyodon.

Zanclodon?

Rhopalodon?

1. ................................................................................................................................................................................................................................................................................................................................................................................................

Galesaurus?

1. Dicynodontia

   ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

Dicynodon.

Dicynodon,

Oudenodon.

1. Placodontia

   ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

Placodus.

1. Lacertila

   ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

Hyperodapedon,

1. ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

Hyperodapedon.

Saurosternon.

Telerpeton,

Rhynchosaurus.

1. Plesiosaurus

   ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

Nothosaurus,

Pistosaurus,

Simosaurus, &c.

1. Ichthyosaurus

   ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

Ichthyosaurus?

Amphiba—

1. Labyrinthodontia

   ................................................................................................................................................................................................................................................................................................................................................................................................

1. ................................................................................................................................................................................................................................................................................................................................................................................................

Labyrinthodon.

Labyrinthodon,

Melosaurus,

Gonioglyptus,

Mieropholis.

Mastodonsaurus,

Zygosaurus,

Pachygonia.

Metopias,

Chalcosaurus.

Trematosaurus,

Capitosaurus.

 

5. The Arctogæal province constituted in Triassic times.

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

1. See the memoirs by Lea and Leidy in the second volume of the second series of the 'Journal of the Academy of Natural Sciences.'