26 VERTEBRATA OF THE TERTIARY. 



saurus and Dimorphodon, or the fishes of the Dapediidce. This formation, 

 80 important in Europe, is almost omitted from the North American series. 

 Several characteristic fossils of the Rocky Mountain region represent the 

 Oolite, particularly the Upper Oolite. Such is a genus not yet distinguisli- 

 able from Megalosaurus. This genus has not been identified beyond doubt 

 from above the Oolite in England. Teleosaurus and Steneosaurus, and 

 their allies, are not yet known from North American beds. From the same 

 beds in the Rocky Mountain region come genera which nearly resemble 

 the one from the English Oolite (Forest Marble) called by Phillips 

 Cetiosauriis, and the genus from the Oxfordian of Honfleur, called by 

 von Meyer Streptospondylus. Beyond this no comparisons can be made, 

 and we therefore pass to the rich fauna of the Kimmeridge. North 

 America cannot show such records of this epoch as have been found in 

 Europe There are no Archceoptenjx, Bhamphorhynchus, nor Pterodactylu^-^; 

 no Leptolepis, Thrissops, nor other of the numerous fishes of Solenhofen. 

 The Omosaurus has, however, some very close relatives in the Camara' 

 saurus beds of the Rocky Mountains. Remains of the primitive Mar- 

 supial fauna which occurs in the Purbeck have been recently detected 

 in the Western Continent. A partial representation of the Wealden fauna 

 of Europe is found in the beds of the Rocky Mountains mingled with the 

 types of the Oolite and Kimmeridge already mentioned. The important 

 genus Camarasaurus represents the Ornithopsis of Europe, and with Amphi- 

 codias included the most gigantic of land animals. The relationships of 

 this fauna to those of the European Jurassic series may be thus exhib- 

 ited: 



American. Kiiroiiciin. 



Camarasaurus Beds. "Wealden. 



f Iguanodon. 



f Ilypsilophodon. Hypsilophodon. 



Hijlceosauriis. 

 t Cettosaurus. Cetiosaurus. 



Camarasaurus. Ornithopsis* 



Amphica'lias. 



fGoniopholis. GoniopJwlis. 



'CJumdrotttotaurut Owen. 



