ROTIFERA. 



387 



SUB-SECTION XII. 

 THE ORDER OF EOTIFERA OR " WHEEL- ANIMALCULES." 



THE Rotifers, as already indicated on page 369, are 

 forms which by some authors are classified with Crusta- 

 ceans, and by others with Yermes. 



FIG. 522. 



Rotifer, Rotifer vulyaris. 



A, with the "wheels" drawn in; B, with the wheels expanded ; a. mouth: &, eye- 

 spots; c, wheels; d, antenna? e, jaws and teeth; /, alimentary canal; </, glandular? 

 mass inclosing it; h, muscles; i, i, tubes of the water vascular system; k, yuuug 

 animal; I, cloaca. 



