1 68 Bulletin American Museum of Natural History. [Vol. XII 



claws upon digits IV and V. The phalanges upon digits IV and 

 V were cartilaginous or incomplete ; these outer digits functioned 

 only in supporting the foot pad. Every known Sauropod pes 

 shows the same deficiency upon the outer side. 



3. Fore Feet of Cetiosaurs. 

 Figures 6, 7. 

 Two restorations of the fore feet of the Sauropoda have been 



])ublished by the 

 late Professor 

 Marsh, namely those 

 of Morosaurus ('96^ 

 Plate 38) and Bron- 

 tosaurus {op . c i t . , 

 Plate 42). It ap- 

 pears ])robable that 

 both are incorrect ; 

 the error apparently 

 has arisen, first, from 

 supplying all the 

 digits with a com- 

 plete series of pha- 

 langes ; second, from 

 placing the largest 

 phalanges upon the 

 inner or ist digit 

 (as in the pes) and 

 gradingoff the small- 

 er phalanges to the 

 5th or outer digit. 

 It is now practically 

 certain that in the nianus as in the pes a number of phalanges 

 were either cartilaginous or missing entirely. It also appears prob- 

 able that the three central digi's II, III, IV bore a full series of 

 phalanges and claws, while the outer digits were deficient in 

 phalanges. 



Fore Feet of Undetermined Cetiosaur. 



The strongest evidence comes from the two fore feet of one 

 individual (No. 332), one of which was found with all its parts in 



Fig. 5. Apteryx. Internal view of right pes. 



