[ 4*9 3 
'Attention, than in thofe Animals we call the moft 
perfect. 
I. Their Colour is generally a reddifh-brown, or, 
more exactly, that of the firft Peel of an Onion. 
Their Length is about Two or Three Inches? their 
Thicknefs that of a common Wire : They are {lender, 
compofed of a Series of membranous Rings, con- 
tinually growing lefs and lefs as they approach the 
Extremities ? each of thefe Rings is furnifhed in its 
inferior Part with Four, Five or Six different forts of 
whitifh Thorns, fupplying the want of Legs. Be- 
fides thefe, the Outfide of the Worms Bill prefents 
fome other remarkable Particulars, and which afford 
an agreeable View to the Microfcope? thefe are the 
Mufcles that ferve for the Motion of the Rings, and 
which form an infinite Number of circular Lines or 
Folds, parallel to each other, which, from the Clear- 
nefs of the Skin, appear to great Advantage : The 
Head has not a conftant Figure, like that of other 
Animals ? the Infeft (ketches it, (hortens it, inlarges it, 
and contracts it at Pleafure : Sometimes it fhews Two 
frnall Elevations one on each Side, which one would 
think fhould be the Places of the Two Eyes,- what is 
beyond, terminates in a Point, to make it more eafy 
for the Worm to pierce the Mud. At the Place 
where the Head is biggeft, between the Two Eleva- 
tions juft now mentioned, the Mouth is placed, ter- 
minated by Two brown Strokes, which may be com- 
pared to the Figure of a Half-moon, or rather that of 
a reverfed Circumflex. When the Infedt opens this 
Mouth, the Opening, which then appears diftindtly, 
is of a circular Shape, and garnifhed all round with 
a pretty thick Mufcle? it is in great meafure this 
. Mufcle, 
