VERTEBRATE PALEONTOLOGY IN 1912 15 



dinosaur from the Upper Cretaceous of Wyoming. As this 

 wonderful specimen was noticed and an illustration of a 

 portion of the skin was given in my last year's article, further 

 mention is unnecessary. 



The structure of the fore-foot of the genus Trachodon is 

 discussed fully in the Bull. Amer. Mus. Nat. Hist. vol. xxxi. 

 pp. 105-7, by Mr. Barnum Brown, who shows that there are 

 four toes, of which the two corresponding with the second 

 and third in the typical pentadactyle series are furnished with 

 hoofs. Unlike the European Iguanodon and its American repre- 

 sentative Champtosaitrus, the trachodonts were unable to make 

 any use of their fore-limbs in progression. 



In a second article in the volume last quoted (pp. 13 1-6) the 

 same author gives a preliminary description of a new genus and 

 species of trachodont dinosaur {Saurolophus osborni) from the 

 Cretaceous of Edmonton, Alberta, characterised by the develop- 

 ment of a tall crest immediately above the eye-sockets. It is 

 also shown that, in common with other members of the tracho- 

 dont group, these dinosaurs had a ring of bones in the sclerotic 

 of the eye. 



Bare mention will suffice for an article by Prof. R. S. Lull 

 on a restoration of the skeleton and external form of the 

 armoured dinosaur Stegosaurus, published, during the year 

 under review, in Verhandlungen des VIII. Internal. Zool. Kon- 

 gress zu Graz of 1910. In connexion with this may be men- 

 tioned an article by Prof. G. R. Wieland {Science, vol. xxxvi. 

 pp. 287-8) on the analogy between the bony plates of the 

 armoured dinosaurs and the shells of the chelonians ; an 

 analogy first suggested by the same writer in 191 1. In the 

 present article this idea is further developed, the author ex- 

 pressing the opinion that " dinosaurs, instead of eventually 

 confining extensive dermal development to a single nether 

 layer covering the body-region only, as in the turtles, tended 

 to develop both the nether and outer layers in the body or 

 skull or both. And this is only another but definite way of 

 saying that dermal armature was variously developed in the 

 Dinosauria or that it tended to assume bizarre patterns." 



An armoured dinosaur, Stegopelta landerensis, from the 

 Cretaceous of Wyoming, forms the subject of a short paper 

 by Dr. R. S. Moodie published in 191 1 in the Kansas Science 

 Bulletin, ser. 2, vol. v. pp. 257-73. 



