132 The Natural History of Se /borne 



the swords of a sword-dancer ; they then trample very quick 

 with their feet, and run backwards towards the females. 



I should tell you that I have got an uncommon calculus 

 cegogropila, taken out of the stomach of a fat ox ; it is per- 

 fectly round, and about the size of a large Seville orange : 

 sucli are, I think, usually flat. 



