16 P. S. Lull — Dinosaurian Distribution. 



Morrison. From the G-uaranitic beds (Daman) of Patagonia 

 two genera of carnivores, Genyodectes (Woodward 1901) and 

 Loncosaurus (Amegliino 1900, p. 61), both similar to Megalo- 

 saurus, have been described. 



The Sauropoda. 



The oldest undoubted Sauropod dinosaur thus far recorded 

 is JDystrophmus, described by Cope (1877), from the Red beds 

 of the Fainted Canyon in southeast Utah, which he refers to the 

 Trias, but which v. Huene (1904, pp. 320-321), upon the evi- 

 dence offered by Whitman Cross, believes to be the equivalent 

 to the Dogger. Doubtless owing to the dearth of Jurassic 

 continental deposits, the American record is a blank from this 

 time until the Morrison and its equivalent, the Lower Fotomac 

 of Maryland. Sauropoda appear in England with the 

 Bathonian (Great Oolite) in the form of the generalized 

 Cetiosaurus. 



The Oxfordianhas produced Ornithopsis, the Kimmeridgian 

 Ornithopsis, Bothriospondylus and Pelorosaurus * the 

 Portlandian, the first of these ; while in the Lower Cretaceous 

 Wealden we find Cetiosaurus, Pelorosaurus, Morosaurus and 

 Titanosaurus (Lydekker non Marsh). Cetiosaurus and 

 Pelorosaurus, v. Huene believes, represent parallel phyla 

 giving rise, in the first instance, to the aberrant American 

 Br^chiosaurus and Haplooanthosaurus of the Morrison, 

 while Pelorosaurus, through an early Morosaurus as a central 

 type, gives rise to Ailantosaurus and Apatosaurus (Bron- 

 tosaurus) on the one hand, and Diplodocus on the other, 

 being succeeded in time by Titanosaurus (Lydekker) which 

 ranges as high as the uppermost Cretaceous. 



The American basal Fotomac beds have produced Pleuro- 

 gozIus, which is also found in the Wealden of England and 

 Furbeckian of France. The Trinity sands of Texas, of prob- 

 able equivalent age to the upper Aptian, contain the remains 

 of Morosaurus, a typical Morrison genus. 



In the southern hemisphere, in Africa, Madagascar and 

 India, in beds of an age approximately equivalent to the 

 Cenomanian, there have been found Titanosaurus and allied 

 genera, such as Gigantosaurus, Bothriospondylus and, in 

 Patagonia in the Guaranitic beds, Titanosaurus, Argyrosaurus 

 and the relatively small aberrant Microsaurus. 



Deperet (1889, p. 692) has also described Titanosaurus from 

 the Rognac, Danian, of Saint Chinian in the south of France, 

 the last record of the Sauropoda in Europe. 



Orthopoda— Ornithopoda. 

 The Ornithopod dinosaurs, which exclude the armored 

 types, make their first appearance in the North American 



