582 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



The Government materials which form the bulk of the collection, 

 as said by Hatcher, 2 were "found in a bed of iron ore near Bladens- 

 burg [Muirkirk], Maryland. The exact locality of the Marsh material 

 was certain iron ore mines on the farm of Mr. William Coffin, and 

 especially in that one locally known as "Swampoodle" and situated 

 about 1£ miles northeast of Beltsville, on the Baltimore & Ohio 

 Railway, some 13 miles from Washington." 



As to the occurrence of these fossils Hatcher says: 



No two bones or fragments of all that material collected from the Potomac beds in 

 Maryland were found in such relation to one another as to demonstrate that they 

 belonged to the same individual. In any discussion as to the affinities of these various 

 genera and species of small Sauropod dinosaurs, not only the immature nature of the 

 remains upon which they have been based, but also the scattered and disarticulated 

 state in which found, must be constantly borne in mind. 



The above remarks as to the scattered state of the specimens apply 

 equally well to those other remains in the collection, subsequently 

 brought together by Professor Bibbins and others. 



THE ARUNDEL FAUNA. 



Our knowledge of the Arundel fauna had its beginning as early as 

 1859, when Dr. Christopher Johnston gave the generic name Astrodon 3 

 without description to certain reptilian teeth obtained by a Mr. Tyson 

 from a bed of iron ore near Bladensburg, Maryland. 



In 1865 these teeth were fully described and figured as Astrodon 

 johnstoni by Dr. Joseph Leidy, 4 they being the first remains of a 

 Sauropod dinosaur to be named and described from North America. 



Twenty-three years later Prof. O. C. Marsh made the next contri- 

 bution 5 to our knowledge of this fauna, when he established two 

 genera and five new species all pertaining to the dinosauria. These 

 were Pleurocoelus nanus, P. alius, Priconodon crassus, Allosaurus 

 medius, and Coelurus gracilis. The presence of turtle and crocodilian 

 remains was mentioned, but it was 10 years later that Dr. O. P. Hay, 

 described a turtle under the name of Glyptops caelatus* 



The next important paper dealing with this fauna was that by 

 Prof. R. S. Lull 7 in which he revised and described all of the materials 

 available at that time. Two species of dinosaurs Creosaurus potens, 

 Dryosaurus grandis and a crocodilian reptile Goniopholis affinis were 

 described as new, and the presence of a fossil gar fish was mentioned 

 for the first time. 



• Annals of the Carnegie Museum, vol. 2, 1903, pp. 11-13. 

 » Amer. Journ. Dental Sci., vol. 9, 1859, p. 341. 



• Smiths, Contr. Knowl., vol. 14, art. 6, 1865, pp. 102-119, pi. 13, figs. 20-23; pi. 20, fig. 10 

 » Amer. Journ. Sci., ser. 3, vol. 25, 1888, pp. 89-94. 



• Fossil Turtles of North America, Carnegie Institution, Washington, 1908, pp. 52, 53, pi. 7, figs. 1, 2. 

 7 Kept. Geol. Survey of Maryland, Lower Cretaceous, 1911, pp. 173-211, pis. 11-20. 



