74 



This tr. ixthnio-iectalis milii was traced already fairly iidnutely 

 by Matskr, tlie sharp observer. He called it "the outer (back) layer 

 of the stratum zonale" of the toi'us' sernicircularis ; but made it 

 originate frontal in the corpus geidculatum externum (nud. prae- 

 tectalis of the authors) and teriidnate caudallv between "numerous 





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