THE BEGINNINGS OF II FE. 



Fig. 92. 



Origin of similar Rotifers, from Vorticellae, and from the direct Trans- 

 formation of Algoid Corpuscles. ( X 6oc.) 



a. Encysted Vorticella. which subsequently may become ovoid and more 

 coarsely granular, as in h, c, preparatory to the conversion of the 

 encysted mass into an embryo Diglena, closely resembling 7. 



d. Small Chlorococcus corpuscles. 



e. A very large, bright green Chlorococcus vesicle, -^-^" in diameter, 



which subsequently becomes decolourized into a mass of orange- 

 brown, granular protoplasm (f), whilst this subsequently becomes 

 converted into an embryo Diglena catellina, a little smaller than the 

 adult form represented at g. This adult form contains a developing 

 ' gemma,' which when laid resembles ^h both in size and in 

 appearance. 

 j. Represents the appearance presented by one of these gemmae (having 

 a very thin investing membrane) after it has been directly con- 

 verted into an embryo Diglena, in which pink eye-specks and a 

 rudimentary pharynx are already visible. 



