250 HENRY C. TRACY 



Fig. 9 Dissection from the right ventrolateral side of the skull to show the 

 relation of the membranous labyrinth to the anterior osseous capsule, also the 

 relation of the anterior and middle divisions of the macula acustica utriculi 

 to the lips of the fenestra. Pomolobus pseudoharengus. 



Fig. 10 Drawing of the ventrolateral side of a reconstruction model of the 

 left labyrinth and of the single embryonic membranous vesicle. Stolephorus 

 mitchilli, 28 mm. in length. The three cristae acusticae in the ampullae of the 

 semicircular canals are shown. The membranous vesicle is drawn transparent, 

 and through it can be seen the three divisions of the macula acustica utriculi. 

 The sacculus projects downward and backward. 



