200 Bulletin American Museum of Natural History. [Vol. XIV, 



Morosaurus, scapula relatively short, spreading superiorly ; scapulo-coracoid 

 plate relatively broad ; limbs intermediate in length ; tibia, fibula and meta- 

 podials relatively slender. 



Brontosaurus, scapula long, narrow superiorly ; scapulo-coracoid plate rela- 

 tively narrow ; limbs long and heavy ; tibia, fibula and metapodials relatively 

 robust. 



Diplodocus, scapula expanding superiorly with intermediate scapulo-coracoid 

 extension, limbs long and relatively slender, tibia and fibula, radius and ulna, 

 and metacarpals especially elongated. 



Camarasaurus , thus far found only in the Colorado Jurassic, is not related to 

 Brontosaurus, as Osborn formerly supposed, but is a Morosaurus of immense 

 size. The type skeleton will shortly be described. 



The distinctive scapulo-coracoid characters are clearly brought 

 out in the accompanying figures (Fig. i, A, B, C). 



Fig. I. Scapulo-coracoid of; A. Morosaurus^ Amer. Mus. Coll. No. 332 ; B. Diplodocus^ 

 Amer. Mus. Coll. No. 221 ; C. Brontosaurus, Amer. Mus. Coll. No. 222. All from the Bone 

 Cabin Quarry, jj nat. size. 



Fore Limb of Diplodocus, No. 594. 

 In the portion of the quarry explored during 1900, within an 

 area of about 20 feet, were found a scapula and a coracoid which 



