34° Micros cop i c At E ssay s .
* is a fingle mufcle ; it’s anterior infertion is vifible, the Other
end is fixed to the bottom o f the foot o f the laft le g ; it is ufed to
move the foot.
The anterior part o f the mufcle £ is divided into three or four
heads, which crofs the fuperior line obliquely, and are fixed to the
fkin a little above it. The other end is fattened to the membrane
T ,
A n E x p l a n a t i o n of F i g u r e s - 3 a n d 4, o f P l a t e X U .
o r a n A c c o u n t o f t h e M u s c l e s o f t h i s C a t e r p i l l a r
WHEN IT IS OPENED A T THE B A CK , .
P r e p a r a t i o n e o r F i g ,. 3-,
The mufcles were not only difengaged from all extraneous
matter, as before, but as it reprefents the third figure o f Mr.
Lyonet, on the mufcles o f the caterpillar’s back a great many had
been removed before the parts o f the infeft appeared, as delineated
in. this figure.
F i r s t R i n g.
Only two gaftric mufcles, c dj are feen here ; c is broad, and*
has three or four little tails; the firft fixture is at the bafe o f the
lower lip, from whence it defcends obliquely, and is fixed between
the inferior and lateral line.
The
M i c r o s c o p i c a l E s s a y s . 341
Thelittle mufcle d is fattened on one fide to the firft fpiraculum,
and on the other fide, a little lower to the intermediate inferior
and the lateral line; it feems to be the antagonift o f P, which
opens the fpiracula.
The lateral mufcles /3 S are very well feen in this figure; the
pofterior fixture o f § is under the mufcle C, near the fkin of the
neck ; /3 is fixed a little on the other fide o f C, at the middle of
the ring.
S e c o n d R i n g .
Three gaftric mufcles, g, h, i, appear here; g and h are fixed
at the folds which terminate the ring; i has only its anterior
fixture there.
h is triple ; in one o f the divifions it is feparated into two
parts.
i approaches more the inferior line, and is fixed a little beyond
the middle of the ring, where the fimilar mufcle on the oppofite
fide is forked to receive it.
T h i r d R i ng.
h, which was triple in the preceding ring, is double here;
that part which is neareft the inferior line is the broadeft; it has
three tails, o f which only two are vifible.
m
The