THE EAE. 



397 



low septum, which bears the crwta acuztica (cr) on its free border ; 

 seen from above the erista acmt'ica (Fig 1 . 249 II, aa, cr) has concave 



Fig. 247. 



rap 



The right membranous labyrinth of Rana etculfnta ; after Retzins. Magnified 20 times, 

 seen from the inner side ; Fig. 248 seen from the outer side. 



Fig. 247 



aa Anterior ampulla. 

 ae External ampulla 

 ap Posterior ampulla. 

 apn Apertnra partis neglectae. 

 au Apertura utriculi. 

 ca Anterior aemicircolar canal. 

 External semicircular canal. 

 cp Posterior semicircular canal 

 au Canalis ntriculo-saccularia. 

 de Ductus endolymphaticus. 

 / Lagena cochleae. 



IH Macula acustica neglecta. 

 mt Macula acustica sacculi. 

 in it Macula acustica receaeus 



utriculL 



pb Pars basilaris cochleae. 

 pi Papilla ac. lagenae. 

 ppb Papilla ac. basilaris 

 raa Ramnlns ac. anterioris. 

 roe Rain ul us amp. externae. 

 rap Ramulua amp. pusterioris. 



rb Ramulus basilaris. 



rec Recessus utriculi. 



rl Ramnlns lagenae. 



rn Ramnlns neglectos. 



rs Ramulns sacculi. 



t Saccnle. 



tp Sinus utricnli posterior. 



st Sinus utriculi superior. 



tv Tegmentum vasculueum. 



borders anteriorly and posteriorly ; the ends are broad, rounded, and 



