Structural Peculiarities and Behavior 67 



c.c. 



o 



conditions of the canals and sacs as he found them (Figures 8, 9, 

 and 10), and of both with the condition in the typical mamma- 

 lian ear as shown by Figure 7, will at once make clear the 

 meaning of Kishi 's statements. That Rawitz's descriptions of 

 the canals are not correct is rendered almost certain by the fact 

 that Panse, Baginsky, Alexander and Kreidl, and Kishi all agree 

 in describing them 

 as normal in form. 



The only impor- 

 tant respects in 

 which Kishi found 

 the membranous 

 labyrinth, that is, 

 the canals and the 

 ear sacs, of the 

 dancer to differ 

 from that of the 

 gray mouse are the 

 following. In the 

 dancer the cupola 

 of the crista 

 acustica is not so plainly marked and not so highly developed, 

 and the raphae of the ampullae and canals, which frequently 

 are clearly visible in the gray mouse, are lacking (21 p. 478). 



The sound-transmitting apparatus of the dancer, according 

 to Kishi, differs only very slightly from that of the gray mouse, 

 and there is no reason to consider the differences which appear 

 as important (21 p. 478). 



Almost as amusing as the way in which Cyon's theory of 

 space perception disappears in the light of critical research 

 is Panse's explanation of the deafness of the dancer. Fail- 

 ing to find any defects in the auditory apparatus of the inner 

 ear which seemed adequate to account for the obvious lack 



a.b. 



FIGURE 13. The inner ear of the dancer, showing 

 the spiral form of the cochlea. After Kishi. 



