OF ANIMALCULES. 141 



edge surrounded by long cilia (radiating like a fan) : the 

 posterior is rather pointed, and has from five to seven 

 long bristles. Two horns may be observed near the 

 middle. Found in sea- water, 



332. Kerona haustellum resembles the preceding; but 

 the marginal cilia are shorter, and it has no terminal 

 bristles : the two horns are nearer the front edge. 



333. Kbron A pullaster {Oxytricha, E.) — This animal- 

 cule is shewn at figure 190 : the fore part, in addition 

 to the cilia, is stated to have three setae. The cilia, at 

 the opposite extremity, are often separated; at other 

 times they are collected in a cluster, as shewn in the 

 sketch. 



334. Kerona silurus. — In form this species resembles 

 the K. histrio.^ but the head is sometimes more pointed, 

 and the bristles at the lower end project beyond the 

 body ; among these, filaments of confervas often get en- 

 tangled: the back is covered with rows of setaceous 

 hooks. They increase by transverse division. 



