ee 
NERVOUS SYSTEM AND SENSE ORGANS OF AMIURUS. 455 
PLATE VI.—(Continued). 
of the labyrinth, in which the outlines of the asteriscus (as) and 
sagitta (s) are shown resting on the macula acustica lagene cochlee 
and macula acustica sacculi. 
Fic. 8.—Is through the ductus endolymphaticus which connects the sacculi. 
It les in the entrance to the cavum sinus imparis whose osseous 
root here slopes downwards so as partly to close the entrance. 
The sacculi communicates here with the lagen cochlee. The 
wall of the labyrinth below is attached to the crest separating 
the foveae sacculi. The relative position of lagenar and saccular 
branches of the auditory nerve is well seen. The right side of 
the section is immediately behind the vagus foramen, and catches 
the ampulla of the frontal semi-circular canal. 
Fig. 9.—Shows the section of the sacculi in front of the ductus endolym- 
phaticus ; the anterior wall of the ductus is also attached to the 
crest. The ventral surface of the medulla oblongata is separ- 
ated from the labyrinth by a layer of adipose tissue. The solid 
wall of the labyrinth in which the ductus sacculo-utricularis is 
excavated stretches upwards and outwards along the thickened 
exoccipital. 
Fig. 10.—Cuts the labyrinth immediately behind the ductus sacculo-utricu- 
laris (dus). On the lateral wall of the utriculus is one of the 
macule neglecte. The crest separating the foveae sacculi is now 
much wider. 
Fie. 11.—For the region of the brain in the section vide Fig. 3, Pl. V. The 
utriculus is cut behind the recessus utriculi. The posterior divi- 
sion of the auditory nerve with its interpolated ganglion-cells is 
not yet subdivided into Rr. lagene and sacculi. The anterior 
tips of the sacculi are about to enter the small cavities in the 
prootics which receive them ; they are surrounded by delicate 
tubes of dura mater. 
