214 Annals of the Carnegie Museum. 



The height of the cuboid is as great as in P. carrikeri, while the 

 antero-posterior and transverse diameters are considerably less. The 

 calcaneal and astragalar facets are, as in the latter species, equally 

 divided on the proximal face. The plantar tuberosity extends lower 

 down and is more pointed, but not nearly so robust as in the older form. 

 The descending plantar hook of the navicular is very robust both 

 fore-and-aft and laterally, while the fibular division is not as deep nor 

 so much to one side as in the older type. The anterior lip, with which 

 the cuboid articulates, is consequently less perfectly wedge-shaped 

 and has a greater vertical diameter. The facets for the coossified 

 ecto- and meso-cuneiforms vary in outline from round to oblong. 



The coalesced ento- and meso-cuneiform is of relatively smaller 

 size and has not the triangular outline, which it possesses in Promery- 

 cochcerus carrikeri and the Merycoidodonts generally, the posterior 

 angle being less produced behind. On the fibular face the bone is 

 slightly damaged, but the plantar angle is complete. Proximally 

 there is a single large facet for the navicular. The distal surface is 

 almost entirely taken up by the articular facet for the third meta- 

 tarsal; the facet for the second metatarsal is somewhat smaller than 

 in P. carrikeri and, as usual, is situated higher up, so that the head 

 of Mt. II is above that of Mt. Ill, when the bones are in position. 



The ento-cuneiform is an irregularly shaped sesamoid-like bone, 

 having a considerable vertical diameter. Above it articulates, as 

 usual, with the inferior face of the navicular, continues past the meso- 

 cuneiform on its plantar tibial face, with which it articulates, and 

 extends well down on the postero-internal face of the head of IMt. II, 

 with which it also articulates by a broad concave surface. 



Between the distal end of the entocuneiform and on the posterior 

 face of the head of Mt. II was found a minute sesamoid-like nodule 

 which has the position of a first metatarsal. This nodular bone has a 

 perfect articular facet which rests against Mt. II as stated above, 

 while on its internal face it is slightly damaged. Whether or not 

 there was present an articulation for the ento-cuneiform cannot be 

 stated. On the latter bone a rounded narrow margin on the posterior 

 face close to the facet for Mt. II may be seen, which, however, could 

 hardly be regarded as a true facet. While the hallux may possibly 

 still be represented in these forms it is also quite possible that a sesa- 

 moid might have lodged in this suggestive position. At all events 

 caution should be exercised until more material is found, proving or 

 disproving that the condition found in the present specimen is normal. 



