CERATOPSIAN DINOSAURS FROM MONTANA GILMORE 



9 



The foot is complete except for the loss of the proximal end of 

 metatarsal I and the ungual phalanx of digit I. It is possible that 

 digit 5 may have been represented by a remnant of the metatarsal, 

 but no trace of this bone was found. 



Metatarsal I lacks its upper extremity, but it is quite evident from 

 the relationships of the distal ends in the matrix (fig. T) that it was 

 about three-fourths the length of metatarsal II. The shaft is very 

 slender, flattened on the inner side where it laps against metatarsal II, 



Figure 8. — Right pes of Leptoceratops sp. (U.S.N.M. No. 13863) : Viewed diagonally. 



One-half natural size. 



the lower end divaricated away from the axis of the foot. The artic- 

 ular face is subquadrangular, with the lateral sides of the end 

 excavated, more especially the outer. Metatarsal II is slightl}^ longer 

 than metatarsal IV. The shaft is straight. The proximal end is 

 elongated anteroposteriorly, the distal end transversely. Beginning 

 about one-third its length from the distal end the outer side of the 

 shaft thins out to a sharp edge and presents a flattened surface that 

 looks more backward than outward and is closely opposed to meta- 



141865—39 2 



