xlvi 
which it is divided, as it were, into head, 
thorax, and belly. 
5 Hairs growing round the tail, ina circular 
form, by means of which this part floats on 
_ the furface of the water, while the reft of 
the body remains under water, with its 
downwards. 
¢ The head, whofe mouth is divided into 
three parts. The two lateral parts, which 
are, properly fpeaking, the infedt’s feet, 
vibrate, while it remains alive, like the 
tongues of ferpents. 
BU Gs a1, 
Another kind of thefe Worms, in its defcent 
to the bottom. 
a The hairs of the tail, difpofed in an oval 
form, and containing a bubble of air within 
their cavity. 
& Two bubbles of air, difcharged by the 
Worm at its breathing-holes, tending to the 
furface of the water. 
Bylo Gui Hh. Ay 
A microfcopical view of the firft Worm. 
12 3, &c. Twelve rings, by which it is di- 
vided into head, thorax, belly, and tail. 
This figure likewife fhews in what manner 
the fkin is beautifully covered with. minute 
grains and fpots. On one fide too there 
appear nine breathing-holes. 
a The tail, refembling a ftar, compofed of 
beautiful hairs. 
66 Delicate hairs, which in this figure appear 
only about the fides of the body, as I have 
omitted reprefenting them on its upper part, 
or on the infeat’s back. 
cc. Two larger hairs, growing on each fide 
of the body. 
d The head. ee The eyes. 
J The crooked fnout. : 
g Thelegs, fituated near the {nout. 
b b ‘Two blackith horny bones, which are, as 
it were, the thumbs of the feet. 
zz The horns, or artenne. 
PUBSTCG. EV 
The grains of the fein, viewed with a great 
magnifier, fo as to fhew their confiruction. 
a The fkin appearing between the grains. 
4 The prominent part of the faid grains, ex- 
exactly in the middle. 
¢ The irregular rings of the faid grains. 
d Sharp prickles growing on the edges of the 
grains, to whofe firmnefs they contribute. 
BAG +... 
A leg, magnified. 
a Three mufcles, furnifhed with a tendon, 
A Short Explanation of the TAB LES. 
of a fubftanee between bone and horn, and | 
placed on one fide of the firft joint of the leg. 
6 ‘The faid joint, which is black, and likewife 
of a fubftance between bone and horn. 
¢ Two {maller mufcles, with their tendons. 
d Another joint, of a fubftance between bone 
and horn. - 
e The extreme joint of the leg, with its brift- 
ly hairs. 
J The thumb of the foot. 
PiolG, Vi 
The fnout inverted, and bigger than nature. 
@ The fnout, and all its parts. 
6 Thetharpand crooked extremity of the fnout. 
¢ The internal opening of the mouth, through 
which the infect’s food pafies to the gullet. 
dd The membranaceous divifions of the mouth, 
by which the palate can be bent, and made 
to give way. 
e Part of the mouth, entirely confifting of a 
black horny bone. 
FIG. VIL 
The fahival veffels, or at leaft two parts analo~ 
gous to fuch veffels, 
a Two falival veffels curled, and ending in 
blind extremities. 
6 A fingle channel, in which they terminate. 
cc ‘Two particles, as it were, refembling 
mutcles. . 
d ‘The upper part of the mouth, from which 
the eyes, and two parts of the head, fup- 
porting the eyes, have been feperated. 
PA Bt es 
EL Gor 
The Worms pulmonary tubes. 
aa Two very confiderable branches of the 
pulmonary tubes. 
6 Pulmonary tubes in that part where the op~_ 
tic nerves, and the membranes of the grow-~ 
ing eyes, are fituated. 
ccc Some pulmonary tubes, which run into 
each other from each fide of the body. 
dddddd A mutual communication of the 
pulmonary tubes, at each fide of the body, 
under the fkin. 
eeee The circumference of the fkin, de- — 
noted by dots. 
f The tail, in which the two main trunks of | 
the pulmonary tubes are opened by two 
channels. 
FIG. II. 
Curls or folds of the pulmonary tubes. 
aa Two portions of the pulmonary tubes 
drawn afunder. . 
6 Their 
Pe ee ge a 
