800 
many Creodonta, but which cannot be said therefore to overlap : 
the astragalus, as in the Amblypoda. 
I have obtained a cast of the top and sides of the cerebral 
F bdodon Cope, 
bones, two-thirds nat. s Fig. a, right 
femur, posterior view. Fig. 4, left astrag- 
alus, from above; 6’, do., distal end; c’, 
calcaneum, distal end; d, cuboid, from 
below ; e, metatarsals, lacking M. L., from 
below; f, penultimate phalange; g, un- 
gual phalange, from below. Original. 
but the internal cusp is more distin 
The Condylarthra. 
_ describe it in detail in another 
[August, 
cavity, and the proximal por- 
tion of the olfactory cham- 
bers, from a skull of a Perip- 
tychus in which the teeth are 
preserved, and prove the spe- 
cies to be the P. rhabdodon, | 
place, but state here that the 
olfactory lobes are enormous, 
and the hemispheres small 
and very flat. The mesen- 
cephalon is entirely exposed. It 
is probably the lowest known 
mammalian brain (Fig. 9). 
The posterior three premo- 
lars are preceded by tempo — 
rary teeth in both jaws. Of i 
these the anterior is protr : 
at about the same time as the 
first true molars, and is the 
last one shed, remaining until 
after the last true molar 1s "7 
protruded. The last milk pre — 
molar differs from the - a 
one in its : 
is very ant 
sembling a perman 
molar, except that 
i edor. 
nia i little more = 
n isa The 
