“I 
= 
A FISH BRAIN FROM THE COAL MEASURES 1 
11 
Fig. 10 Drawing of the left inner ear of a fish from the Coal Measures of 
Kansas. X 7. a.a., anterior ampulla; qa.v.c., anterior vertical semicircular canal; 
b., ampullary enlargement; cer., lateral lobe of the cerebellum; h.c., horizontal 
(lateral) semicircular canal; op.l., optic lobe; p.c.v., posterior vertical semicir- 
cular canal; s.a.a., an accessory enlargement of the anterior ampulla; s.w.s., 
sinus utriculi superior; wf., utriculus; s.v.a., sinus utriculi anterior; this sinus 
enters the utriculus in a postero-lateral direction. 
Fig. 11 A reconstruction of the inner ear of a fish from the Coal Measures 
of Kansas; based on three specimens. X 7. a.a., anterior ampulla; a.v.c., 
anterior vertical semicircular canal; 6., anterior ampullary enlargement. (In 
two specimens this enlargement is three times the size here represented) ; h.c., 
horizontal (lateral) semicircular canal; p.a., posterior ampulla; p.v.c., posterior 
vertical semicircular canal; s.a.a., an enlargement of the anterior ampulla; 
sac., sacculus; s.s.p., sinus sacculi posterior; s.u.a., sinus utriculi anterior; s.u.s., 
sinus utriculi superior; wé., utriculus. 
