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PKOCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 87 



been subjected to wear have transversely compressed crowns that are 

 rounded anteroposteriorly with dentate borders. The four posterior 

 teeth retained in place in the maxillary of U.S.N.M. No. 13683 have the 

 crowns much worn. Their outer surfaces have a characteristic sculp- 



FiGUEE 4.^Teeth of Leptoceratops sp. (U.S.N.M. No. 13864) : Side (A), inner (B), and 

 outer (C) views of worn upper tooth ; D, inner view of slightly worn lower tooth. 

 Natural size. 



ture, consisting of a prominent vertical ridge placed slightly posterior 

 to the middle of the crown and lesser ridges both in front and back 

 of the main carina. While the main ridge merges into the cingulum 

 at the base of the crown, the lesser ridges fade out 

 before reaching the base. On the inner face the sur- 

 face is sculptured by a series of lesser parallel ridges, 

 which appear to correspond in number to the denti- 

 cles on the cutting edge. The four teeth in the 

 maxillary (fig, 3) occupy a space 33 mm, in length. 

 In the figures of the teeth of Le'ptoceratofs gracilis 

 as illustrated by Brown,^ they have been inadvert- 

 ently mislabeled; the outer should be the inner, in 

 both the upper and lower teeth. 



Hind limb and foot. — The right hand limb and 

 foot of U,S.N.M. No. 13863 were found articulated 

 and for the first time give a complete knowledge of 

 the pes and tarsus in the genus Leptoceratops. Only 

 the distal third of the femur is preserved, but it 

 shows the same straight shaft, round in cross section, 

 with distal articular face at right angles to the 

 shaft as found in L. gracilis. In outline the distal 

 end is squarish with a deep intercondylar notch 

 (fig, 5). 



The tibia is complete, but the proximal end has been badly com- 

 pressed. The ends are relatively less expanded than in the typical 

 ceratopsians and the shaft is subround, but insofar as it can be com- 



FiGURB 5. — D i s t a 1 

 end of right femur 

 Leptoceratops sp. 

 (U.S.N.M. No. 

 13863) : External 

 view. O n e - h a 1 f 

 natural size. 



» Bull. Amer. Mus. Nat. Hist., vol. 33, figs. 2, 6, 1914. 



