246 
aa—Ampulla anterior. 
ae—Ampulla externa. 
ap—Ampulla posterior. 
cra—Crista acustica ampulle anterioris. 
cre—Crista acustica ampulle externe.. 
mu—Macula acustica recessus utriculi. 
ms—Macula acustica sacculi. 
pl—Papilla acustica lagene. 
mn—Macula acustica neglecta. 
na—Nervus acusticus. 
ra—Ramus anterior. 
rp—Ramus posterior. 
raa—Ramulus ampulle anterioris. 
rae—Ramulus ampulleze externee. 
rs—Ramulus saceuli. 
rl—Ramulus lagene. 
rap—Ramulus ampulle posterioris. 
ov—Oval opening into sacculus from the canalis utriculitsaccularis. 
byv—Blood-vessel. 
cap—Capula terminalis. 
ep—Epithelial lining. 
g—Ganglion cells. 
o—Otolith. 
Fig. 1. Right ear. Viewed from the exterior and above. The dotted 
lines show the planes of sections. x12. 
Fig. 2. Brain and right ear. Dorsal view. The nerves are shown 
black. The fibers for the most part are under the ear, but they were 
seen through the membranous parts. x 21. 
Fig. 3. Brain and right ear. Ventral view. x 23. 
Fig. 4. Cross section of utriculus and the crista in the external canal. 
x 195. 
Fig. 5. Part of a vertical section through the brain, ramulus sacculi, 
and sacculi. The course of the ramulus sacculi is shown here. x195. 
Fig. 6. Section showing canalis utriculo-saccularis and the oval open- 
ing through which there is communication between the utriculus and the 
sacculus. The sections were made parallel to the sinus utriculo-superior. 
x 195. 
