3S 6 



Microscopical Essays, 



The tracheal artery was alio removed. ' 



Explanation of the first Ring. 



We fee fully here the mufcles C * £ and (i) which were but 

 partly feen in the preceding figure, and the garble mufcles g, 

 which were not feen there. 



The mufcles C * occupy two rings ; it is very difficult to de- 

 termine their precife number ; ten may be counted at the anterior 

 end, which are collected in one fafcicle, and inferted at the fide 

 of the upper part of the parietal fcale, immediately under the 

 mufcles £ ; towards the lower end thefe mufcles fpread like a fan, 

 and a greater number may be counted ; they communicate 

 laterally with each other by reciprocal branches, which makes it 

 difficult to determine whether they fhould be confidered as fingle 

 mufcles, or as fo many diftinc~r ones. The lower extremity of all 

 but the two I aft crofs, at the fuperior line of the fecond ring, the 

 tails of fimilar mufcles on the oppofite fide ; after which, they 

 are inferted at the fkin beyond this line. 



There are five lateral mufcles £, fometimes fix ; they have their 

 firll fixture at the fide of the head, their lower part widens, and 

 k inferted lengthways in the fecond divifion. 



The mufcles 0 of the firft ring, as well as the fimilar mufcles of 

 the nine other rings, are better feen in this than in Fig. 1 ; as 

 they are placed over the divifions, they may be termed dividing 

 mufcles. That of the fecond divifion has been feparated to fhew 

 the mufcles underneath. It is fingle as well as that of the third 



divifion 



