302 



COMPARATIVE ANATOMY 



is drawn out to a considerable length, and the part of the wall of 

 the cochlea on which it lies is called the basilar membrane, while 

 the opposite wall is spoken of as the membrane of Reissner 



-co, 



ac 



rec 



Fin. 221. RIGHT MEMBRANOUS LABYRINTH OF RABBIT (Lepus cuniculm). A, 

 from the inner, and B from the outer side. (After G. Retzins. ) 



esc, canalis reunions Henseni ; /, facial nerve ; lift, spiral ligament ; mb, basilar 

 membrane ; rb, basilar branch of the auditory nerve (ac) ; *, sinus utri- 

 cularis sacculi. (Other letters as Figs. 216-220.) 



(membrana vestibularis) (Fig. 223) : this is already represented in 

 Reptiles. 



Except in Monotremes, the papilla acustica lagense has dis- 

 appeared : thus in other Mammals there remain only six patches of 

 nerve-endings. 



