A FISH BRAIN FROM THE COAL MEASURES 169 
vaio leaky 
oe afi Olfactory tr 
ee \ 
Zateral lobe~ 
of Cerebel/um ‘ Se 
* “ Semicercular 
* eer Canal. 
\ Be a ‘ 
Tuberculum 
acusticum 
Fig. 6 Dorsal view of the brain of a Coal Measure fish. X 5.5. This same 
brain is figured in figures 5 and 17. The type of brain is entirely similar to the 
one shown in figures 15 and 16. (*) marks a venous sinus, formerly interpreted 
as pineal body. For discussion of these points see text. 
Fig. 7 The cross section of the olfactory tract of the Coal Measures fish 
brain shown in figures 15 and 16. X 40. Rhin., rhinocele. 
