Microscopical Essays. 347 



1 is a large mufcle which co-operates with M ; in opening and 

 {hutting the fpiraculum, one of it's fixtures is near the intermediate 

 inferior line, at about the fame height as i ; the tail finifhes a little 

 lower than the fpiraculum. 



Twelfth Ring. 



There remains here only the gaflric mufcle d, which is a fafci- 

 cle of fix, feven, or eight mufcles ; the firft fixture of thefe is at 

 the fubdivifion of the ring, near the inferior line ; one or two 

 crofs this, and at the fame time the fimilar mufcles of the oppo- 

 site fide. Their fixture is at the bottom of the foot ; their func- 

 tion is to concur with the mufcle a, in bringing back the foot, 

 and loofen the claw from what it lays hold of. 



We perceive here the mufcle a • one of it's infertions is at the 

 bottom of the foot, near d; the other extremity near the fub- 

 divifion of the ring. 



Explanation of Fig. 5 and 6, Plate XII. 



The anatomical delineation of the head, which is given at Fig. 

 5 and 6, fhould be cOnfidered as confifting of two figures, which 

 join in the middle, being terminated by the inferior and fu peri or 

 lines. It will be impoffible in this place to give more than a very 

 loofe idea of the head of the caterpillar in thefe two figures, as M. 

 Lyonet found it necefiary to employ twenty, in order to diiplay 

 properly the organization of this part. Thefe will, however, be 

 iufficient to give feme idea of it to thole who cannot procure or 

 read the work itfelf; it may alfo ferve to ftimulate thofe who 



U u 2 hav* 



