I06 THE OCEAN WORLD. 



genus Paramecium, he adds, that in former writers a Hnk was wanting, 

 viz., tracing the young actually hatched from the egg of a Planariaft. 

 '' This deficiency," he says, " I can now fill. It is another Iiifusormm, 

 a genuine Opalina. With such facts before us, there is no longer any 

 doubt left respecting the character of all these Polygastria ; they 

 are the earliest larval condition of worms," 



