Microscopical Essays, 337 



divifion ; that of the fourth is double ; they appear more nu- 

 merous in the fucceeding divifions, though they are, in general, 

 only double, feldom triple, but much thicker; thofe of the third 

 and fourth divifion pafs over the tracheal artery, whilft all the 

 others go under it: we find them at all the divifions but the firfl; 

 and laft. 



Second Ring. 



The dorfal mufcles are fufficiently feen in this ring, to enable 

 the obferver to form fome idea concerning them. 



C is the only one which is fairly expofed ; it has it's poflerior 

 tnfertion at the third divifion, near the intermediate fuperior line, 

 from whence advancing obliquely it becomes forked, one branch 

 paffes under the dividing mufcle, and is fixed to the £kin, from 

 whence it again proceeds, and forms the fine long mufcle oc 

 of the firfl: ring. The other branch is fixed to the fkin, near the 

 lateral line, under the mufcle y of die fecond ring. 



When the mufcle C and fome of the mufcles C # are removed, 

 we fee the whole of D ; the direction of this mufcle is en- 

 tirely contrary to that of C. 



* After taking away D, we difcover the mufcle E, which is' in- 

 clined towards the fame fide as G, but not fo obliquely. By 

 taking away E we are enabled to fee the mufcle F, which is 

 parallel to D : thefe three laft mufcles are fixed to the divifions 

 which terminate the rings : the lateral mufcles are not feen fo as 

 to be defcribed. 



Tt , The 



