138 ANNAL8 NEW YORK ACADEMY OF SCIENCES 



From the upper beds of the Morrison formation near Canon City, Colo- 

 rado. Only a few vertebrae are known. 



Brontosaurus excelsus Marsh 



Brontosawus excelsus Marsh, Notice of New Jurassic Eeptiles. Ainer. 

 Journ. Sci., 3rd ser., vol. xviii, p. 503, 1879. 



This form is perhaps the best known of the Sauropoda. The type 

 specimen was found in the Morrison beds at Como Bluff, near Medicine 

 Bow, Wyoming. Other material of the species has been found in the 

 Morrison beds at various localities. Nearly the complete skeleton is 

 known. 



Brontosaurus ampins Marsh 



Brontosawus am plus Marsh, Principal Characters of American Juras- 

 sic Dinosaurs. Pt. V. Amer. Journ. Sci., 3rd ser., vol. xxi, p. 4.21, 1881. 

 Morrison formation at Como Bluff. Part of skeleton known. 



Diplodocus lacustris Marsh 



Diplodocus lacustris Marsh, Principal Characters of American Jurassic 

 Dinosaurs. Pt. VII. Diplodocidse, a New Family of the Sauropoda. 

 Amer. Journ. Sci., 3rd ser., vol. xxvii, p. 166, 1884. 



Morrison formation near Morrison, Colorado. Known from frag- 

 mentary material only. 



Pleurocoelus nanus Marsh 



Pleuroccelus nanus Marsh, Notice of a New Genus of Sauropoda and 

 other new Dinosaurs from the Potomac Formation. Amer. Journ. Sci., 

 3rd ser., vol. xxxv, p. 90, 1888. 



From the Arundel beds in Maryland, probably near Muirkirk. Char- 

 acteristic parts of the skeleton are known. 



Pleuroccelus altus Marsh 



Pleuroccelus alius Marsh, Notice of a New Genus of Sauropoda and 

 other new Dinosaurs from the Potomac Formation. Amer. Journ. Sci., 

 3rd ser., vol. xxxv, p. 93, 1888. 



From the Arundel formation near Muirkirk, Maryland. Part of hind 

 limb only is known. 



Morosaurus lentus Marsh 



Morosaurus lenius Marsh, Notice of New i\.merican Dinosauria. Amer. 

 Journ. Sci., 3rd ser., vol. xxxvii, p. 333, 1889. 



