OF ANIMALCULES. 95 



quince, Laving the larger or anterior extremity dentated, 

 as shewn by the cross. Sometimes, as in figure 91, a 

 large bright pustule is observed ; at others, this is want- 

 ing. The posterior extremity is capable of expansion, 

 and of being flattened out like a wedge, or bent in a 

 spiral form, at the pleasure of the animalcule. It is 

 nearly twice the size of the last species, and of a milk- 

 white or grey colour. 



