HISTOLOGY OF THE FROG 89 



nally as a fine fibril ; this probably becomes continuous with, 

 or comes in contact with, a terminal fibril of the optic nerve. 



Hair-cells from the crista acustica of an ampulla of the ear 

 are shown in fig. 15, B. Each is a pyriform cell, the narrower 

 end turned towards the cavity of the ampulla, and bearing 

 on its truncated free surface a long stiff hair-like process which 



Fig- 15- 



Various forms of sensory epithelium. A, two forked cells from the tongue 

 of the frog ; B, B', two forms of auditory hair cells from the crista 

 acustica of the anterior ampulla of the frog's ear ; C, three rods and a 

 cone from the retina of the frog's eye ; D, two olfactory cells, with 

 their epithelial supporting cells from the frog's nose. (All the figures 

 after Haslam in Ecker's " Anatomy of the Frog." Engl. Ed.) 



rests by a broad base on the cell. The opposite broader end 

 of the cell usually appears rounded, but sometimes a fine 

 fibril may be seen springing from it, and this probably 

 becomes continuous with a terminal fibril of the auditory 

 nerve though the connection has not been actually traced. 

 The characters of taste-cells may be learned by an inspection 

 of fig. 15, A. 



