3 go S. W. WILLISTON 



A second specimen, in a small block of matrix belonging with 

 a smaller animal, has the bones in the positions shown in Fig. 5, 

 K. The distal ends of the epipodals, the calcaneum, fifth tarsale, 

 and first tarsale are shown very clearly in the outline, but in their 

 excavation from the hard matrix the surface of the tarsal bones 

 has been somewhat injured. Crowded in the space below the 

 tibia the bones of the external side of the tarsus are more con- 

 fused and injured; but they confirm, so far as they can be deci- 

 phered, the arrangement shown in Fig. 5, /. The calcaneum (Fig. 

 4, M) is shown very perfectly and undistorted in a free specimen 

 found in the clay. The heel is distinctly produced and has a slight 

 cartilaginous thickening on its border for the Achilles tendon. 

 The tibial surface shows very distinctly the notch for the per- 

 forating foramen. Elsewhere the borders are rather thin, save 

 that for the articulation with the fibula. The fifth tarsale is shown 

 very completely. It is of unusually large size, filling out the space 

 between the calcaneum and the fifth metatarsal. All these bones 

 in this specimen lie evidently in a natural position, the bones 

 closely articulated. 



Only four metatarsals are preserved together in any specimen, 

 though the presence of the first tarsale would seem definitely to 

 indicate the presence of the full five. It is also evident from these 

 that the bones of the fibular side were stronger than those of the 

 tibial, corresponding to those of the front feet, though the differ- 

 ence is not so great. Parts of three digits are shown in Fig. 4, R, 

 as they were preserved in a small mass of clay. Doubtless the 

 whole foot or the greater part of it had been present, but only these 

 were recovered, though it is probable that the bones shown in 

 Fig. 4, S, belong with the same specimen. The single metatarsal 

 of adult size shown in Fig. 4, U, seems to correspond in its proximal 

 and distal ends with the fourth; and it is evident that the digit 

 showing the two phalanges of Fig. 4, R, is the fifth. The phalanges 

 shown in Fig. 4, 5, are in all probability the distal ones belonging 

 with the two metatarsals shown in Fig. 4, i?, that is, of the third 

 and fourth digits, and that two proximal ones of each digit were 

 ones probably corresponding in size pretty well with those of the 

 fifth toe of Fig. 4, R. On these assumptions the feet may be 

 restored with much probability. 



