PAL.EOSYOPS LEIDY, AND ITS ALLIES. 
337 
being the broadest. The form and length of the inferior facet of tins species differ 
widely from tliat of P. paludosus. The inferior facet is continuous with the 
sustentaculum. The anterior face of the astragalus is slightly convex from above 
downward; its cuboidal margin is verj' oblique and this border joins the ental at 
the prominent inferior ridge of the astragalus already described. The astragalo- 
cuboid focet is wide above and narrows below to join the sustentaculum. Instead 
of running across the whole cuboid margin of the astragalus as in P. paludosus this 
facet in P. minor takes up only one-half of the whole length of this border, the 
lower portion being occupied by the sustentacular, which, owing to its oblique posi- 
tion, runs up on it. In P. pahtdosus, owing to the horizontal position of the 
sustentaculum, this facet is limited wholly to the inferior surface of the astragalus. 
Nainadar . — The characters of this bone as compared with those of the larger 
species are nearly the same, but its calcaneal face is more concave and the depth of 
the bone is greater in comparison to its width. The distal facets of the navicular 
are subecjual, that for the mesocuneiform being slightly smaller than in P. pahidosus. 
The facet for the entocuneiform is not well marked in this specimen. The cunei- 
form bones are wanting in this pes ; thej" were probably wider and not as high rela- 
tively as in the larger species. 
Cuboid . — The cuboid of P. minor is strikingly different in form from that of 
P. paludosus. It is a nearly square bone with the depth scarcely exceeding the 
width. The tuberosity of the cuboid is large, heavy and medially j)laced. The 
proximal face is subdivided by a very prominent ridge separating the rather large 
astragalar fiicet from the calcaneal. The astragalar facet is short and broad ; its 
plane forming a more acute angle with that of the calcaneal than in P. paludosus. 
This portion of the cuboid bearing the astragalar facet is contracted oft' in a 
neck-like process quite different from that seen in P. paludosjis. The calcaneal facet 
takes up about two-thirds of the distal face of the cuboid and is very broad and 
shallow. The distal face of the cuboid is remarkably ffat and square', posteriorly it 
narrows, but its transverse diameter is relatively greater than in P. paludosus. The 
cul3oid of P. minor can be readily distinguished from that of Hyrachyus. In the latter 
it is long and narrow with a small astragalar contact ; its tuberosity is also more 
acute and laterally placed in the last named genus. There are two other cuboids in 
the collection which correspond in all their characters ^\uth those given for the 
above ; they differ, however, in being mucli larger, 'and I tliink they probably belong 
to one of the large species of TelmatotJierium. If this supposition is correct, the 
specimens are of interest, as they show the close relationship between P. mimor and 
Telmatotherium. This affinity has also been proven from the dentition of P. minor. 
Metatarsals, (PL XIV, fig. 44.) — The metatarsal region is shorter and more 
slender than in the larger species. The shape of the metapodials is, however, the 
same. The j^roximal part of metatarsal II is externally abruptly cut off’ and exhibits 
no entocuneiform facet ; its shaft is broad and short. The facet on metatarsal II for 
the mesocuneiform is elongate and concave transversely. Metatarsal III is more 
