1192 The Amblypoda. [ December, 
abundantly, while the herdsmen obtain water for them by digging 
holes in the sand of the river beds wherever water may be found 
in this manner. If the drouth still continues beyond this stage, 
the cattle are driven toward the coast to where water may be had, 
or they are left to perish of thirst. 
Without experience of such circumstances it is, perhaps, not 
easy to realize the force of the argument, but after riding for 
days through this region with a tropical sun blazing overhead, 
the atmosphere so dry that it seems to parch one’s very vitals, 
and the heat from the glaring white sand quivering upwards toa 
cloudless sky, the thin catinga forest shriveled and still, with not 
a sign of animal life save the metallic stridulation of an occa- 
sional grasshopper, and after passing now and then a whole day 
without water, one realizes the importance which savage races, 
dwelling in such a country, would attach to a stream or pool 
where water could be had during the dry season. 
THE AMBLYPODA. 
BY E. D. COPE. 
(Continued from page 1121, November number. }? 
PANTODONTA. 
f Wiese is known as yet but a single family of this suborder, 
the Coryphodontidz. Its representatives have been found in 
the lower lacustrine Eocene beds in Europe and North America 
in considerable abundance. About twenty species have been de- 
scribed, of which three have been found in England and France, 
and the remainder in the Rocky Mountain region of North 
America. They form a curious and interesting group of hoofed 
Mammalia which did not survive the Lower Eocene time, except 
in their probable descendants, the Dinocerata. The characters 
of the suborder have already been given in the NATURALIST, page 
tiii. 
Five genera of the Coryphodontidæ are known from dental 
characters. Two of these, Coryphodon and Bathmodon, are 
known in their skeletal structure, the first-named very thoroughly. 
1 The circumstances under which I found the remains of extinct mammals mas 
region lead me to believe that their extermination was caused by long drouths 
great areas. 
2 The explanations of Fig. 7 (p. 1115) should read four-ninths nat. size; 
thirds nat. size. 
not two 
