Article XL— FORE AND HIND LIMBS OF CARNIVOR- 

 OUS AND HERBIVOROUS DINOSAURS FROM THE 

 JURASSIC OF WYOMING. DINOSAUR CONTRIBU- 

 TIONS, NO. 3. 



By Henry Fairfield Osborn. 



In the Bone Cabin Quarry, opened by the American Museum 

 Expedition of 1898, under the direciion of Dr. J. L. VVortman, 

 assisted by Mr. W. W. Granger, were found mingled together 

 bones of all the most characteristic Upper Jurassic Dinosaurs, in- 

 cluding six nearly or quite complete limbs and three fore feet, 

 which form the subject of this paper. Four of these are shown, 

 as mounted, upon a subsequent page. They are not only grand 

 objects of their kind, but they bring out a number of new and 

 important facts relating to the limbs of Dinosaurs of the Mega- 

 losaurand Cetiosaur divisions or Ornithopoda and Sauropoda. 



I. Hind Limbs of Carnivorous Dinosaurs. 

 Figures 1-5, 



The late Professor O. C. Marsh described ' five genera of flesh- 

 eating Dinosaurs from our Jurassic, namely : A/losaurus, the 

 largest of the flesh-eaters ; Creosauriis, a smaller allied form ; 

 Labrosaurus, of another type ; Coslieyas, a very small animal dis- 

 tinguished by hollow bones (related to the somewhat older Hallo- 

 pus) ; and finally Ceratosaurus, a large animal with horned nasals. 



Of these, the most nearly allied to Megalosaurus of the English 

 Purbeck is Allosaurus, distinguished by possessing less than five 

 vertebrae in the sacrum, also by other characters of doubtful 

 value {op. cit., p. 239), and figured {op. cit., PI. XL) as possessing 

 three digits in the pes, while Megalosaurus is assigned four digits, 

 in the pes {op. cit.., p. 239). Whether or not Allosaurus is distinct 

 from Megalosaurus cannot be positively determined at present. 

 The distinction based upon the nurr.ber of digits is here shown 

 not to hold good. 



Two hind limbs from the Bone Cabin Quarry, which corre- 

 spond in other respects with those of Allosaurus, appear to show 

 that the hallux had been detached in Marsh's specimens. They 



• The Dinosaurs of North America, 1896. 

 [Oct., /c?99.1 [161] II 



