116 



THE THIRD DAY. 



Fig. 36. 



[CHAP. 



2L7ZB 



jrs 



Section through the Internal Ear op an Embryonic Sheep (28 mm. 



in length). (Copied from Boettcher.) 



D.M. Dura Mater. R. V. Eecessus vestibuli. //. V.B. Posterior vertical 

 semicircular canal. U. Utriculus. H.B. Horizontal semicircular canal. 

 b. Canalis reuniens. a. Constriction by means of which the sacculus 

 hemisphericus S.R. is formed. /. Narrowed opening between sacculus 

 hemisphericus and utriculus. C.C. Cochlea. CC. Lumen of cochlea. 

 K.K. Cartilaginous capsule of cochlea. K.B. Investing mass. Ch. 

 Chorda dorsalis. 



