An Explanation of the Figures* 



Fig. it. 12. The fame Infedt 

 and its Reverfe in its natural Attitude, 

 magnified. 



Fig. 13. 14. 15. Three of its 

 Scales, as they appear through the 

 greateft Magnifier. 



Fig. 16. The Egg of the Thorn- 

 back opened, a Portion of the out- 

 ward Cafe being thrown afide, in order 

 to obferve the Contents : The Whole 

 drawn as it appears to the naked 

 Eye. 



An 



