THE ROTIFERS. 



43 



popularly supposed to be " a horse-hair come to life." They 

 occur tied up iu a " Grordiau knot" at the bottom of pools. 



.^M» 



Q\ 



Fig. 43. — Trichina 

 encysted in hu- 

 man muscle. 

 Greatly magni- 

 fied. 



Fig. 44. — The Hair-worm. 

 A', natural size; /. end 

 of body of G. aquaticus; 

 H, G. varius. Much 

 enlarged. 



Fig. 45. —Rotifer vulga- 

 ris c, ciVmted flaps or 

 wheels; e, mastax; g, 

 digestive canal; A;, 

 eggs. Highly magni- 

 fied. 



Thej live as parasites in the bodies of grasshoppers, crick- 

 ets, beetles, etc. 



Class III.— Rotatorta {Rotifers). 



General Characters of Rotifers.— The Rotifers, or wheel- 

 animalcules, are abuiulaiit in standing water, in damp 

 moss, etc., and in the ocean, and are so transparent that 



