THIS ROTtFmS. 
53 
popularly supposed to be a liorse-liair come to life." They 
occur tied up in a Gordian knot" at the bottom of pools. 
Fig. 55.— Trichina Fig. 56.— The Hair-worm. Fig- ^"7— Rotifer vulga- 
encysted in hu- K, natural size ; I. end ris c, ciliated flaps or 
man muscle. ot body of G. aquaticus; wheels; e, mastax; <7, 
Greatly magni- H, Gr. varius. Much digestive canal; fc, 
fied. enlarged. eggs. Highly magni- 
fied. 
They live as parasites in the bodies of grasshoppers, crick- 
ets, beetles, etc. 
Class III. — Eotatorta {Rotifers). 
General Characters of Rotifers. — The Rotifers^, or wheel- 
animalcules, are abundant in standing water, in damp 
moss, etc., and in the ocean, and are so transparent that 
