A Short Explanation 
FIG. VIL 
VI 
The three humours of the eye. 
a Two needles with which the tunica uvea, 
_ lying under the microfcope, is pricked. 
6 The aqueous humourifluing from the wound- 
ded eye. 
c The vitreous humour flowing out in the 
fame manner. 
d The cryftalline humour iffuing like the others. 
TAB, V. 
Pipes 
The open parts of the mouth and jaws. 
a Theexternal fkin in the form of teeth. 
© The tooth, placed high in the mouth, cut, 
with the fkin, from one fide, expcfed to 
view. 
¢ The tooth fpread out into horny bene points, 
like needles. 
d The falival veffels, with their openings. 
e The inner lips, behind which the mouth is 
folded together. 
f Acartilage which covers the tongue, when 
the Snail fwallows its food, under which the 
tongue may be fheltered in the cavity. All 
thefe parts are fhewn, unfeperated, Fig. IV. 
Letter 7. 
1 Bal fe bate! i fd 
The Tooth. 
@ The whole horny bony coalition of the teeth. 
_ 6 The eight prominent teeth of it. 
¢ The crooked crefcent form of the teeth. 
POG ALE 
The tongue, and certain mufcles. 
a The tongue, taken out of the mouth. 
45 The root of the tongue, with its fituation ; 
the tongue itfelf, as it appears, where all the 
parts of the jaws and mouth are reclined to 
the other fide. 
¢ The two horny bony teeth in the acute ex- 
tremity of the tongue. 
d The three mufcles, which move the parts of 
the gullet and mouth forward. 
PGs si. 
The heart, its auricle, and the blood and falival 
veffels. 
a The reins, which are vifible in the internal 
membrane of the border of the Snail, as 
they are derived from the trunk of the vena 
cava. 
b The aperture of the border. 
¢ The heart with its two valves, and fibrous 
columns. 
of the TA BUS 
d The auricle of the heart. 
e The alkaline bag, in its proper place, near 
the heart. 
J The ftraight gut, near which runs the pipe of 
the alkaline bag. 
g The {preading branch of the great artery. 
6 Certain large branches and fprigs of the 
great artery. 
7iz2z The circumvolution and fhape of the 
body reprefented by dots ; that the fituation 
of thefe parts may be the more exactly de- 
monftrated. Here may be further obferved : 
a The oblong grooves or channels of the fto-- 
mach. 
o o The falival veffels. 
pp The trunk from which the falival veffels 
{pring. 
q A {mall veffel which runs over that trunk. 
ry All the parts of the mouth, 
FUG. V. 
The alkaline bag. 
k That part of the alkaline bag which is con- 
nected with the Pericardium. 
J The angle where the alkaline bag is con- 
nected with the inteftine and liver. 
m Another part of the alkaline bag adjacent to 
its own pipe, and of a waterith colour. 
N. B.We have joined in oneTable the Fig. IV. 
and V. the explanations of which are here 
feperated, becaufe though we found, in the 
author’s manufcript, the explanation of Fig. 
V. by itfelf, yet we could not meet with the 
figure itfelf apart in theTable; but that does 
not fignify, as it may be underftood by the ~ 
fourth figure. 
FIG. VI 
The fiomach, inteftines, and liver. 
a The extreme winding of the liver. 
666 The lobes of the liver, where it ap- 
pears at once, after what manner the in- 
teftines are wound about ; a certain part of | 
it, with the ftomach, is reprefented out of 
its place. 
c The ftomach. 
e The ftraight gut. 
J The paffage of the inteftine into the border. 
& The part where the biliary ducts empty them- 
felves into the inteftine. 
FIG. VII. 
The fame parts reprefented, as reviewed from the 
other fide. 
a Theliver. 6 The inteftines. 
c The ftraight gut. § d The ftomach 
| F L.G.. VII. 
The biliary Wissen 
a The naked biliary duds, with a {mall part 
of the liver. 
d 'The Pylorus. 
6 The 
