224 NATURAL HISTORY. [CH. XV. 



in a spiral direction, resembling the mainspring of 

 a watch, or a roll of riband ; and, according to 

 Reaumur, who had the perseverance to unrol one 

 of these coils, it was found to be about two inches 

 and a half in length. 



The spiral coil of Larvae of the Blowfly removed from the 

 Abdomen, and partly unrolled. 



Another insect, evidently congenerous with the 

 blowfly, but of which the species is not recorded, 

 was likewise observed by Reaumur to be ovo-vivipa- 



Large Gray Blowfly magnified, with the Abdomen opened 

 beneath, showing the already hatched Maggots. 



