246 



HENRY C. TRACY 



=SCM 



Fig 3 Diagram of the right membranous labyrinth and supracerebral pen- 

 labyrinthine canal of Alosa sapidissima, based on figure 12; orientation diagram 

 of the approximate planes of the sections shown in figures 4, 5, 6, and 7. 



Figs. 4, 5, 6, and 7 Sections through the right labyrinth and supracerebral 

 perilabyri'nthine canal at levels shown in the orientation figure (fig. 3). 



