NOTODIAPHORUS CRASSUS 37 
the plantar side are the most marked features. The 
ectal facet is in two planes, the anterior portion being 
bent down to nearly right angles with the 
posterior, which seems to be characteristic 
of this Diadiaphorus series. ‘The susten- 
tacular facet also is characteristic, being 
gently rounded and extending clear to the 
navicular facet on the head, in Dzadia- 
phorus becoming actually confluent with ae ae 
the navicular facet. Just at the edge of Plantarside:., ectalfacet 
—1/2 natural size; b, sus- 
this sustentacular’ facet isa ‘timy sufface feotectlar facet; ¢, facet 
where the astragulus rubs on the cuboid, 
the only case, as far as I am aware, where this occurs in 
any Litopterna. 
The calcaneum is long and slender, the tuber being but 
slightly enlarged, its sustentacular facet being a broad 
oval surface, while the ectal facet is in two planes to cor- 
respond to that on the astragulus. ‘The facet for the cuboid 
is at the distal end, but is unusually oblique, its inner 
margin sloping up almost to the sustentacular facet. It 
is this slope which brings the cuboid in contact with the 
astragulus. 
The navicular is broad and low, with a prominent hook 
behind. On its upper face there is only the broad facet 
for the astragulus head; on the lower face are three facets, 
externally, a large, more or less triangular area, for the 
ectocuneiform; medianly a smaller similar facet for the 
mesocuneiform; and on the internal side, sloping up onto 
the internal face, a small facet for the reduced endocunei- 
form. On the external face of this bone there is a tiny 
beveled facet for the cuboid. 
The endocuneiform is a large scale-like ossicle articulating 
on the lateral internal face of the navicular, and over- 
lapping markedly the inner surface of Metatarsus II. 
The mesocuneiform is considerably reduced in_ size, 
carrying a broad flat facet on the upper surface for the 
