380 



CYCLOPTERID/E. 



by means of the mechanical contrivance on the frame-work. 

 The longer muscles placed nearer the outer oval edge are 

 probably instrumental in preserving the contact of the more 

 flexible margin, and the serrated external edges of the 

 parallel laminae help to preserve the degree of elevation ob- 

 tained : the adhesive power, as before observed, is in propor- 

 tion to the area of the vacuum. 



