346 



AVERS. 



cells of the large epithelial ridge are shown to form part of the hair band, and are 

 well developed at this stage. 



Fig. io. Surface view of the pillar heads of Corti's rods, showing the relative sizes 

 and numbers. From the adult Rabbit. X 1400. i., inner, 0., outer, pillar head. 



Fig. II. A hair cell with short hair; basal remnants adhering to its cap. Rabbit 

 X 850. This figure is very much like those published by Gottstein and Waldeyer. 

 Chromic acid preparation. 



Fig. 12. Transverse section of ear sac of Torpedo inarniorata embryo i| cm. 

 in length, showing the beginnings of canal development in the ear, and the relation 

 of the endolymphatic duct to the sac. X 114- in.u., the utricular sense organ. 

 e.c, external canal. 



Fig. 13. One of the openings of the habenula perforata and the transmitted 

 nerve of the Dog, seen slightly obliquely. X 1065. The nerve, before it enters the 

 membrana basilaris, stains red (its sheath). The rest of its distal portion unstained, 

 and composed of axis cylinders only. 



