PLATE 3 



EXPLANATION OF FIGURES 



Fig. 17 Ear vesicle of Amblystoma transplanted to Rana in reversed position. 

 A III, two weeks after operation. Normal position regained. Lateral and 

 anterior semicircular canals visible. Between the anterior semicircular canal 

 and the brain a small vesicle can be seen which, from its form and structure, is 

 judged to be the endolymphatic appendage. The acousticofacial ganglion is 

 attached medially to the vestibule. X 66. 



Fig. 18 Ear vesicles of Amblystoma transplanted to Rana in reversed position. 

 A II, two weeks after operation. Normal position regained. Endolymphatic 

 appendage and lateral semicircular canals visible, the former located between 

 the crus commune and the brain. The ganglion also in nonnal position. X 66. 



Fig. 19 A section from a different part of the same specimen. Normal position 

 regained. Posterior and lateral semicircular canals and lagena visible. X 66. 



Fig. 20 Ear vesicle of Amblystoma transplanted to Rana in reversed position. 

 C I, two weeks after operation. Normal position regained. Posterior and lateral 

 semicircular canals and lagena visible. X 66. 



Fig. 21 Ear vesicle of Amblystoma transplanted to Rana in reversed position. 

 C II, two weeks after operation. Normal position regained. Abnormal develop- 

 ment. Endolymphatic appendage visible. X 66. 



Fig. 22 Ear vesicle of Rana transplanted to Amblystoma; B II. Normal 

 position regained. Development practically normal. X 66. 



Fig. 23 Ear vesicle of Rana 10 days after operation. Inversion on the trans- 

 verse axis. Rotated. X 66. 



Fig. 24 Ear vesicle of Rana 10 days after operation. Inversion on transverse 

 axis. No rotation. Endolymphatic appendage lateral; lateral semicircular 

 canal dorsal. X 66. 



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