HEARING AND CEREBELLAR FUNCTIONS 



133 



This greatly enlarged area appears to diminish gradually in extent 

 towards the middle line, so as to give the appearance of a p\Tamid 

 (in section), the ai)ex of which nearly meets that of the oj)j)osite 

 side. The small-celled tissue at the apex becomes gradually 

 replaced by elongated pear-shaped cells, which bridge the inter- 



PLATE 25. 



CAA 



A transverse section of the brain of the Black Scabbard fish (Aphanopus carbo) 

 across the commencement of the acoustic. A.T. — tubercles and the cere- 

 bellum. The central acoustic area C.A.A. is well seen and fibres passing from 

 it to the auditory nucleus. S.G. — Stratum granulosum and S.M. — Stratum 

 moleculare of C.L.M. — Cerebellum. 



vening gap. The cerebellum in this section is completely separated 

 from the acoustico-lateral areas, and has its typical conformation 

 of strata granulosum and moleculare. But continuous and inferior 

 to the small-celled area we have just described is a narrow area of 

 transverse fibres interspersed with rows of small cells, which we 

 recognise as similar to the central acoustic area we have described 

 in the carps. The remaining portion of the lobe consists of a tissue 

 similar to that of the stratum moleculare with a few^ large cells 



