Microscopical Essays, 331 



fide of each caterpillar are perfectly fimilar, it was not only un- 

 neceffary to reprefent them, but by joining another view of the 

 mufcles, as in Fig. 2, we are enabled to exhibit thofe mufcles 

 which were covered in Fig, 1, and by this means fave much time 

 in the defcription, and the addition of another plate. 



The dorfal mufcles, or thofe of the back, are marked by capital 

 letters ; the gaftric mufcles, or thofe of the belly, by Roman let- 

 ters ; the lateral mufcles by Greek characters. Mr. Lyonet has 

 only given a name to thofe among the latter, which are marked 

 {) ; thefe are placed upon all the divifions, from the fecond to the 

 eleventh ; they are called dividing mufcles, on account of their 

 fituation ; a mufcle that has been once marked with a letter 

 always retains the fame, both in the defcription and the other 

 figures. 



Preparation, 



The caterpillar was emptied, and the mufcles freed from the 

 maffes of fat, the nerves, and other veflels, which, if they had 

 been left, would have confufed the view of the mufcles., and ren- 

 dered it difficult to diftinguifh and trace them. 



First Ring. 



The mufcle A is double. The anterior one is thick at top, 

 and feems to be divided into different mufcles pn the upper fide, 

 but it has no fuch appearance on the under fide. One of their in- 

 fertions is towards the head, at the fkin of the neck ; the other 

 infertion of the firft mufcle A is a little above, and that of the 



S s 2 feconj 



