426 



BIOLOGY OF THE PROTOZOA 



the sporoblasts are emitted (Fig. 182). In Gregarina ovata they 

 are quite short but reach a considerable length in other species of 

 Gregarina and in Clepsidrina. 



Fig. 181. — Endogenous budding in Gregarinida. A to D, Eleutheroschizon 

 dubosqui and formation of endogenous agametes. E to G, Schizocystis sipunculi 

 and similar formation of agametes. {A to D, after Brasil, E to G, after Dogiel.) 



Gamete dimorphism is highly variable in different species of greg- 

 arines. Isogametes are produced by some species of Monocystis, 

 anisogametes by others although here the differences are slight. 



