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



There is little question that the metacarpals belong to this fore 

 limb, although they were found mingled with metatarsals of a 

 hind limb of corresponding size. By comparison with several 

 series of metatarsals belonging to Morosaurus and Brontosaurus in 

 the American Museum Collection, their homologies can be de- 

 termined. Examination of the proximal facets for articulation 

 with the carpals, shows that Mtc. I is 

 deep and relatively narrow ; Mtc. II 

 is somewhat deeper and broader, and 

 increases in size ; Mtc. Ill is less deep, 

 but much broader in front ; Mtc, IV 

 is still shallower, but of equal front 



Fig. 4. Metacarpals, left manus, of 

 Diplodocus, with supposed radiale plus 

 intermedium. Amer. Mus. Coll, No. 

 588. 8 nat. size. 



Fig. 5. Metacarpals of right manus 

 of undetermined Sauropod, probably 

 Morosaurus, 



1. Proximal view of metacarpals. 



2. Anterior view of metacarpals. 



3. Distal view of metacarpals. 

 Amer. Mus. Coll. No. 462. | nat. size. 



breadth ; Mtc. V, like Mtc. I, is deep, but narrow in front. The 

 measurements given above are much affected by crushing, but 

 indicate that Mtc. Ill is the largest and stoutest of the meta- 

 carpals, while Mtc. I and Mtc. V are relatively short. 



Fore Limb of Diplodocus, No. 588. 



The above characters are supplemented and confirmed by 

 those of another fore limb (No. 588), consisting of ulna, radius, 

 supposed scapho-lunar, supposed cuneiform, metacarpals I, II, 

 III, IV, and a terminal phalanx. The metacarpals correspond 

 approximately with those figured by Marsh. 



