174 ROY L. MOODIE 
Anlerior LS UR. Fronlal lohe 
pertorated SPace pr). 4B of cerebrum 
= (ee 24k) Gee 
fe 
tA 
Zempora! lobe 
OF cerebrum 
Na 
inlerpedlan -. 
j cularis 
~--Trachus 
peduncuiarts 
Tran sversus 
", 
Oy) 
" ar - Cerebellum 
Tredulla--- <8 
y. 
af, 
" 
Fig. 14 Ventral view of the brain cast of an oreodont mammal, probably 
Merycoidodon culbertsoni Leidy, from the White River series (Oligocene) of 
South Dakota. X 1. Scott (’13, p. 372) says of these animals: The Oreodontidae 
“was one of the most characteristic of North American artiodactyl families, 
and its members were exceedingly abundant throughout the Upper Eocene, the 
whole Oligocene and Miocene, ending their long career in the Pliocene. In dis- 
tribution the family was exclusively North American, and no trace of it has been 
found in any other continent. . . . . Dr. Leidy, who first discovered and 
named most of the genera, spoke of them as combining the characters of camel, 
deer and pig, and called them ‘ruminating hogs.’ .... ” 
Fig. 15 Dorsal view of the brain and inner ear of the Coal Measures fish 
from Kansas. 8. The proportions of the parts of the brain shown in figures 
15, 16, and 17 are accurately obtained by measurement with fine pointed calipers 
under the binocular, adjusted by a fractional millimeter scale. The entire 
length of the brain, as preserved in the best specimen which is figured in this series 
is a fraction over 15 mm. The dorsal portions of the thalamus and vagal lobe 
were broken or eroded before the specimens were studied. The sinus utriculi 
superior (s.uv.s.) is evident as a broken end just above the ‘S’ of the word sacculus. 
The utriculus (U/r.) and sacculus have apparently a wide connection and the 
limits are uncertain, as indicated in the lettering. They resemble greatly the 
structures of the same name in Acipenser sturio. From the broken end of the 
sinus utriculi superior (s.w.s.) arose the anterior and posterior vertical semi- 
