106 THE MEMBRANOUS LABYRINTH, BY PROF. RUDINGER. 



that although the cells rise and fall, the two rows do not 

 separate from one another. The furrow between the two walls 

 does not appear to be lined by an epithelium. I do not believe 

 that this constitutes a terminal nerve apparatus, since the 



Fig. 309. 



Fig. 309. Transverse section of the semicircular canal of the Rana 

 temporaria. 1, Cartilage, with a few connective-tissue corpuscles ; 



2, fibrous plexus, with connective-tissue corpuscles and pigment cells ; 



3, pavement epithelium. 



branches of the nervus acusticus are not distributed over the 

 ampullae; and I have not been able to distinguish any primitive 

 nerve fibres external to the wall of the canal. Is it possible that 

 the two walls and the furrow they bound stand in any rela- 

 tion to the undulatory movement of the endolymph ? 



Amongst Batrachia I have only examined the labyrinth of 

 the Frog. The membranous semicircular canals are perfectly 

 circular in section, and the walls are everywhere of uniform 



