R. S. Lull — Dinosaurian Distribution. 15 



Jurassic. 



Daring Jurassic time the record is confined practically to 

 England and the adjacent parts of France until the ushering in 

 of the North American Morrison and Potomac toward its 

 close. 



While several species of carnivores are found in England 

 and France during this period, they are all referred to the 

 genus Megalosaurus with the exception of the Kimmeridgian 

 Streptospondylus of England and Compsognathus of equiva- 

 lent age from the lithographic limestone of Solenhofen, 

 Bavaria. 



Dr. A. Smith Woodward (1906, pp. 1-3) has recently 

 described a Megalosaurian ungual phalanx from the Lower 

 Jurassic of Victoria, Australia. He does not, however, sug- 

 gest a more precise correlation of the beds with those of 

 Europe. 



Lower Cretaceous. 



The American Morrison in the West and the basal Potomac 

 (Patuxent-Arundel) in the East have yielded a number of 

 Theropoda ; from the Potomac, Allosaurus, the American 

 representative of Megalosaurus and Codurus ; while the Mor- 

 rison has produced, in addition to these forms, Creosaurus and 

 Labrosaurus, the horned carnivore Ceratosaurus, and the 

 agile " bird-catching " dinosaur Ornitholestes. 



In Europe the Wealden, probable equivalent in part to the 

 American Morrison, has produced numerous remains of 

 ^Megalosaurus. This genus is also reported from the Albian 

 or Gault of France and from the Bellasien of Portugal, considered 

 by Chaffat to be midway between the Aptian and Cenomanian. 



Upper Cretaceous. 



In the Upper Cretaceous, ushered in by the Cenomanian, 

 the European species of Theropoda are, almost without excep- 

 tion, referred to the genus Megalosaurus, a well-nigh incredible 

 range, Lias to Danian, for a single genus, even of a relatively 

 conservative type. Deperet (1899, p. 692) has referred a 

 carnivore from the Danian (Pognac) of Montagne-Noire, 

 France, to the genus Dryptosaiirus, first made known from the 

 Upper Cretaceous of New Jersey. 



The New World carnivores, on the other hand, have been 

 given various names ; of these the principal types are Drypto- 

 saurus of the New Jersey Greensand and the Judith River 

 (Senonian) of Montana and Alberta and Tyrannosaurus of the 

 Laramie (Danian) among the huge Megalosaurs ; while the 

 lesser race is represented by Ornithomimus of the Judith 

 Piver beds, a probable derivative from Ornitholestes of the 



