I 72 Bulletin American Museum of Natural History. [Vol. XII^ 



that we are correct in associating with it the short phalanx with 

 an imperfectly rounded distal extremity. 



The 2d metacarpal is very powerful, with a heavy rounded 

 shaft and distinct distal articulation, from which three phalanges- 

 extend, the terminal a heavy claw, if our placing is correct. 



The 3d digit affords the strongest support for the mesaxonic 

 hypothesis, for it is by far the largest metacarpal, and is obviously 

 the centre of the foot. Witli it must have been associated (as in 

 the present mounting) the heaviest phalanges and claw. 



The 4th metacarpal is considerably lighter and longer, and un- 

 fortunately its complement of phalanges is represented only by 

 phalanx r, the others being ;idded or restored. 



The 5th metacarpal is stout but slightly shorter than the 4th. 

 With it was apparently associated the remaining imperfectly 

 formed phalanx i, which was found with this foot. 



If these two imperfect phalanges are not placed upon digits I 

 and V, it is very difficult to place them at all. It thus appears 

 probable that digits I and V were deficient in all the phalanges 

 except the first or first and second, and served merely to support 

 the weight of the animal. 



The admirable methods in the field, which have been largely 

 developed by Dr. J. L. Wortman, whereby every piece is kept 

 and transported in the po&ition in which it was found, sup- 

 plemented by admirable museum methods, will soon render our 

 knowledge of the Dinosaurs not only far more complete, but far 

 more accurate than ever before. The writer is indebted to Dr. 

 Wortman for many hints in the discussion of the carnivorous 

 limbs above described. The writer desires also to express his 

 indebtedness to Mr. Adam Hermann, not only for the skill 

 displayed in mounting these specimens, but for the excellent 

 judgment and knowledge he has shown in locating and bringing: 

 together the scattered parts. Owing] to the imperfect ossification 

 of the joints, the bones of Dinosaurs are much more difficult ta 

 place than those of mammals. 



