CRETACEOUS DINOSAURS 211 



been an instance of contemporary desiccation before burial. Here the 

 skin is preserved with its complex arrangement of minute scales and 

 entirely bereft of defensive armor, together with portions of the muscles, 

 as well as nearly the entire skeleton, with the exception of the hind feet 

 and tail. This specimen, which was purchased of Mr. Sternberg by the 

 American Museum, is now on exhibition. Another similar specimen, 

 entire except for a small part of the tail and with the skin impression 

 covering a cast of the body, was also found by Sternberg in Converse 

 County in 1910 and sold to the Senckenberg Museum. 



In the Old World the most notable discoveries are those of Baron 

 Nopcsa at Siebenbiirgen, whence he described in 1899 a new genus and 

 species of Iguanodon-like character known as Limnosaurus (now Tel- 

 matosaurus) transylvanicus, and in 1902 and 1904 skull remains of 

 Mochlodon. I^opcsa's paper of 1902 also contains his views on the 

 phj'logeny of the Ornithopoda. 



8TEG0SAURIA 



Upon the Stegosauria important progress has been made, not only in 

 the light of new discoveries, but toward the completion of the Stego- 

 sauria monograph as well. It seems now very clear that at least two 

 important lines of descent may be traced — one shorter lived, terminating 

 in the tallplated Stegosaurus, the first mounted skeleton of which has 

 recently been erected at Yale; the other culminating in the heavily 

 armored Anla^losaurus described by Brown. The true stegosaurs, like 

 the Sauropoda, culminated in ^orth America in the Morrison. 



The ankylosaurs are represented by a number of more or less similar 

 genera, of which the first to be described was Marsh's Nodosaurus 

 textilis, from the Pierre, near Como Bluff, Wyoming, of which consider- 

 ablelnaterial now in process of preparation is preserved at Yale. This 

 family in America at least is exclusively confined to the Upper Cre- 

 taceous, appearing first in the Xiobrara long after the extinction of the 

 aberrant stegosaurs. The ankylosaurs differ from the stegosaurs in the 

 more generalized character of the dermal armor, the median carina of 

 the scutes in the former not having suffered the enormous hypertrophy 

 seen in the stegosaurs. In the ankylosaurs there is a tendency toward 

 the fusion of the scutes into a broad rump shield and into an immense 

 Glyptodon-like tail sheath, the phylum terminating in the most ponder- 

 ous animated citadel the world has ever seen. 



CERATOrSIA 



In regard to the Ceratopsia, since the publication of the Ceratopsia 

 monograph in 1908 several new skulls have been brought to light in the 



