208 



A number of fragments, mostly distal extremities of tibiae, of which one is 

 represented in Fig. 9, Plate XX. The general construction is the same as 

 in ordinary even-toed ungulates. The shaft approaching the articulation is 

 three-sided, with the outer border subacute. This terminates in a triangular 

 surface for junction with a fibula. The internal malleolus is comparatively 

 long and pointed, and projects below the position of the anterior process of 

 the tibia. The articular concavities are nearly of the same extent fore and 

 aft, but the outer one is much the wider. The width of the end of the tibia 

 in different specimens ranges from 13 to 14 lines, and the fore and aft diam- 

 eter is 8£ lines. 



Of a number of specimens of the astragalus, one is represented in Fig. 10, 

 Plate XX. It is about the size of that of the peccary, but is proportionately 

 wider. The outer division of the trochlea is considerably larger than the 

 inner one. The posterior articular surface for the calcaneum extends but 

 little more than half the width of the bone. The length of the astragalus 

 externally is 16 lines ; its width at the lower tarsal articulation is 10£ lines. 



Of a number of specimens of the calcaneum, one is represented in Fig. 11. 

 It is about the size of those of the peccary, but is more robust in its propor- 

 tions. The tuber is a little shorter, but considerably thicker. A peculiarity 

 of the bone is the absence of a sustentaculum tali, the usual articular surface 

 of the latter being supported on a moderate expansion of the base of the 

 tuber. The articular eminence for the fibula is but slightly prominent. 



The length of the calcaneum is 2£ inches ; its width at the articulation 

 below the tuber is 8 lines. 



Another specimen of a calcaneum, interesting on account of its diseased 

 condition, is represented in Fig. 15, Plate II. 



Merycochoerus sp ? 



Fig. 12, Plate XX, represents the distal end of the tibia, probably of a 

 smaller species of Merycochoerus. The specimen was found with those 

 above described. The transverse diameter of the articular end is 11 lines. 



An astragalus resembling that above described probably belongs to the 

 same animal as the latter. It is 10^ lines long, and 5£ lines wide. 



Order Solidungula. 



Associated with the remains of Merycochoerus, from the Sweetwater 

 River, there are several bones of a small equine animal, probably a species 



