Drvrlopnifiit of A nipli/huiii har VcsicJe 



437 



fourth Avas (juite impeitecr, consisting of only a large vesicle with 

 a thickened epithelial floor connected bv a few nerve cells and 

 fibers with the braiii. 



Fig. 3 Reconstruction of a tadpole labyrinth one month old, which when a primitive ear vesicle was 

 rotated from the normal position i8o° in one direction, so as to lie with invaginated side toward the brain. 

 A section through the same labyrinth is shown in Fig. 4. Enlarged 55 diameters. 



Fig. 4 Section through the membranous labyrinth shown in Fig. 3. It shows that though originally 

 turned face inward it has developed in the normal attitude, e, endolymphatic appendage; c.c, crus com- 

 mune; sacc, saccule; c. Int., lateral semicircular canal; gang, acusl., acoustic ganglion. Enlarged 

 55 diameters. 



Transplanted Specimens. The irregularity of form of the six 

 specimens transplanted to the region between the eye and nostril, 

 previously reported,'' is so great that they give no assistance in solv- 



Streetcr '06, /. c, p. 557. 



