HEARING IN FISH 



49 



PLATE 8. 



BLEAK 



Four transverse sections of the medulla oblongata of the Bleak. 



I. — Posterior across the vagal lobes. II. — More anterior across the small facial 

 or Vllth lobe. III. — Across the central acoustic lobe. IV. — Most anterior 

 across the cerebellum, acoustic, tubercles and central acoustic area. Vag.L. — 

 Vagal lobe. V.L. — Fifth or somatic-sensory lobe. VII. L. — Facial or seventh 

 lobe. C.L.M. — Cerebellum. S.G. — Stratum granulosum. A.T. — Acoustic 

 tubercle. VII.N. — Facial nerve. V.N. — Fifth nerve. C.A.L. — Central acous- 

 tic lobe. 



D 



