WHKKI,-1JEAKEES OK KOTIFKES. oo 



inauy-stomaclied. In these views lie has not been 

 followed by later observers, and it is probable he 

 was misled, partly by pushing the process of rea- 

 soning from the analogies of higher animals much 

 too far, and partly by the imperfection of the 

 glasses lie employed. 



Rotifer vulgaris. — A, mouth, or gizzard; B, contractile vesicle. — Micrographic Bic- 

 iionary. 



N.B.— When the cilia and tail part are retracted, and the body shortened, the 

 creature assumes an obtuse oval form. 



Having thus briefly considered the Vorticellids, 

 we must turn to the wheel-bearer, who belongs to 

 a higher race than even the ciliated Protozoa. We 

 left her crawling about with her snout or proboscis 

 protruded, but now she has moored herself by her 

 tail-foot, pulled in her nose, and put out two groups 



