24 



Marvels of Pond-Life. 



Polygastrica, or many stomaclied. In these views lie 

 has not been followed by later observers_, and it is pro- 

 bable he was misled, partly by pushing the process of 

 reasoning from the analogies of higher animals much 

 too far, and partly by the imperfection of the lasses he 

 employed. 



Having thus briefly considered the Vorticellids we 



Rotifer vulgaris. — A, mouth, or gizzard; B, contractile 

 vesicle. — Micrographic Dictionary. 



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

 body shortened, the creature assumes an obtuse oval form. 



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 pro- 

 truded, but now she has moored herself by her tail-foot, 

 pulled in her nose, and put out two groups of cilia. 



