( 8?<5 ) 
Soimd in the Tympanum ; this Animal has two, or a 
large one with two diSerenc Surfaces. The AqueducS: 
both by its Figure and Pofition in this Animal doth 
plainly fliew us the Ufe of it in other Animals, which 
is to receive the fuperfluous Humours in the Tympanum, 
and convey them to be difcharg’d in the Mouth. 
Explication of the FIGURES. 
Figure h 
R Eprefents the Bony part 
of the Meatus Audi* 
tori us of the Right Ear 9 
a The eoeternal Orifice of the 
Meatus Auditorius. 
b 7 he Prcceflus Petrofus. 
c The Orifice where the Ner* 
vus Auditorius enters. 
d The Meatus Auditorius. 
e A part of the Laminic 
which proceed from it on 
each fide, hy which the 
Cellules betwixt the two 
Tables of the Scull are 
form’d ; thofe Jit uated above 
the Meatus being remov’d. 
3 Part of the inner Table 
of the Scull, 
Fig, II. 
Reprefents part of the 
^.atus. (Auditorius o- 
pened, with other parts of 
the inner Ear. 
a The ragged part of the 
Bone from whence the Os 
Petrofum was feparated. 
b The ProceiTus Petrofus o» 
pened. 
c The Crena for the Mem- 
brana Tympani. 
d The Hony comb Cavity of 
the Tympanum. 
e It 's inner Cavity o f a Jmooth 
Surface, 
f Its Semicircular or undu' 
hted Lines. 
g The Ottfice of the Aque- 
duct. 
h The Orifice of the hard 
Portion of the Nerve. 
Fig. III. 
Reprefents the lower Surface 
of 
