OF N A T U R E. 113 



when upon opening its Ihell it expofes itfelf 

 as a prey to the fmalleft kind of filhes, thefe 

 immediately affault her, and growing bolder 

 upon finding no refiftance venture in. The 

 guard watching its time gives notice by a bitej 

 upon which the pinna clofing its fhell, fhuts in, 

 kills^ and gives part of whatever happens to be 

 there to its companion. 



The pinnu^ and the crah together dwell, 

 For mutual fuccour in one common fhelL 

 They both to gain a livelihood combine ; 

 That takes the prey, when this has given the fign. 

 From hence this crah above his fellows famed. 

 By antient Greeks was pinnoteres named. 



Oppian. 



§. 18. 



Deftruftion. 



We have obferved above that all animals 

 do not live upon vegetables, but that there 

 are fome which feed upon certain animalcula. 

 Nay there are fome which fubfifl only by ra- 

 pinej and daily deflroy numbers of the peace- 

 able kind. 



Thefe animals are dcftroyed, but in fuch a 

 I manner 



